N823AN

Part: LIGHT — DAMAGED (ZONE 200) · airframe 30,196 hrs · 3,590 cycles

AIRCRAFT WAS IN BASE MAINTENANCE: FWD LIGHT FACING 1L DOOR NEAR FLOOR EMERGENCY EXIT LIGHT DAMAGED. REMOVED AND REPLACED - FWD LIGHT FACING 1L DOOR NEAR FLOOR EMERGENCY EXIT LIGHT IAW AMM 53-51-06.

Part: FLOORBOARD — DAMAGED (ZONE 200)

AIRCRAFT WAS NOT GROUNDED: FLOORBOARD SOFT NEAR SEAT 3A. **SUPPLEMENTAL REPORT FOR AALA202408198637: UPON INSPECTION MAINTENANCE FOUND 2 SOFT FLOORBOARDS. REPAIRED FLOORBOARD (AALA202408198637) AND FLOORBOARD (AALA202409231935) PER EA 357260 AND AARD 53-00-50-5 REPAIR 5.C.**(CLOSED)

Part: FLOORBOARD — DAMAGED (ZONE 200) · airframe 29,749 hrs · 3,537 cycles

AIRCRAFT WAS NOT GROUNDED: FLOORBOARD SOFT AND SQUEAKS NEAR SEAT 3A. PEFROMED TEMPORARY REPAIR PER EA 357260. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN).

Part: FLOORBOARD — DAMAGED (ZONE 200) · airframe 29,749 hrs · 3,537 cycles

AIRCRAFT WAS NOT GROUNDED: FLOORBOARD SOFT NEAR SEAT 3A. UPON INSPECTION MAINTENANCE FOUND 2 SOFT FLOORBOARDS. REPAIRED FLOORBOARD (AALA202408198637) AND FLOORBOARD (AALA202409231935) PER EA 357260 AND AARD 53-00-50-5 REPAIR 5.C.

Part: OVEN — SHORTED (NR 7) · airframe 27,680 hrs · 3,275 cycles

AIRCRAFT WAS NOT GROUNDED: OVEN NUMBER 7 POP SOUND THEN SMOKE SMELL.**SUPPLEMENTAL REPORT FOR (AALA202402193973): REMOVE AND REPLACED OVEN NUMBER 7. OPERATIONAL CHECK GOOD. PER AMM 25-32-00.**(CLOSED).

Part: OVEN — SMOKE (GALLEY) · airframe 27,680 hrs · 3,275 cycles

AIRCRAFT WAS NOT GROUNDED: OVEN NUMBER 7 POP SOUND THEN SMOKE SMELL. OPEN.

Part: SPOILER — PARTIAL DEPLOY (RT WING) · airframe 27,611 hrs · 3,264 cycles

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: IN CRUISE FELT A SLIGHT BUMP IN SMOOTH AIR. FOLLOWED BY "SPOILER" ALERT ON EICAS, #5 SPOILER PARTIALLY DEPLOYED. AIRCRAFT DIVERTED AND LANDED SAFELY AT LAX WITHOUT FURTHER INCIDENT. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN).

Part: ACTUATOR — FAULTY (RT SPOILERS) · airframe 27,611 hrs · 3,264 cycles

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: IN CRUISE FELT A SLIGHT BUMP IN SMOOTH AIR. FOLLOWED BY "SPOILER" ALERT ON EICAS, NUMBER 5 SPOILER PARTIALLY DEPLOYED. AIRCRAFT DIVERTED AND LANDED SAFELY AT LAX WITHOUT FURTHER INCIDENT. **SUPPLEMENTAL REPORT FOR (AALA202402164898): REMOVE AND REPLACE NUMBER 5 SPOILER ELECTRONIC CONTROL UNIT (AALA202402124898) AND SPOILER ACTUATOR (AALA202402276979). PER AMM 27-61-18-AND 27-61-16M, OPERATIONAL CHECK GOOD**(CLOSED).

Part: ECU — FAULTED (NR 5 SPOILER) · airframe 27,611 hrs · 3,264 cycles

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: IN CRUISE FELT A SLIGHT BUMP IN SMOOTH AIR. FOLLOWED BY "SPOILER" ALERT ON EICAS, NUMBER 5 SPOILER PARTIALLY DEPLOYED. AIRCRAFT DIVERTED AND LANDED SAFELY AT LAX WITHOUT FURTHER INCIDENT. **SUPPLEMENTAL REPORT FOR (AALA202402164898): REMOVE AND REPLACE NUMBER 5 SPOILER ELECTRONIC CONTROL UNIT (AALA202402124898) AND SPOILER ACTUATOR (AALA202402276979). PER AMM 27-61-18-AND 27-61-16M, OPERATIONAL CHECK GOOD**(CLOSED).

Part: DOOR — OUT OF ADJUST (ZONE 200 - FUSE) · airframe 27,077 hrs · 3,203 cycles

AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT BUNK DOOR IS HARD TO OPEN. ADJUSTED FLIGHT ATTENDANT BUNK DOOR. PER AMM 25-50-30,

Part: MODULE — FAULTY (ZONE 100 - FUSE) · airframe 24,459 hrs · 2,886 cycles

AIRCRAFT WAS GROUNDED: LEFT AUTO THROTTLE INOPERATIVE. RIGHT AUTO THROTTLE WAS ON MEL. FLIGHT DIVERTED TO PHL LANDING SAFELY. MAINTENANCE REPLACED THRUST CONTROL MODULE PER DMC-B787-A-G76-11-01-00A-720A-A. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.

Part: MODULE — FAILED (ZONE 200 - FUSE) · airframe 21,790 hrs · 2,521 cycles

AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DIVERTED TO KEF. EMERGENCY WAS DECLARED AND WAS OVERWEIGHT FOR LANDING. FOUND MAINTENANCE MESSAGE 24-39288, CE2471823 CIRCUIT BREAKER POPPED, STANDBY DC FEED RIGHT POWER DRIVE UNIT 73 FAULTY, REPLACED RIGHT POWER DRIVE UNIT 73M6 (AALA202210179264) AND M7 POWER MODULE (AALA202210179898) AND P300M5 DC2 CIRCUIT CARD (AALA202210173501) PER FIM DMC-B787-A-24-00-F9-BLA-421A-A.

Part: CIRCUIT CARD — FAILED (ZONE 200 - FUSE) · airframe 21,790 hrs · 2,521 cycles

AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DIVERTED TO KEF. EMERGENCY WAS DECLARED AND WAS OVERWEIGHT FOR LANDING. FOUND MAINTENANCE MESSAGE 24-39288, CE2471823 CIRCUIT BREAKER POPPED, STANDBY DC FEED RIGHT POWER DRIVE UNIT 73 FAULTY, REPLACED RIGHT POWER DRIVE UNIT 73M6 (AALA202210179264) AND M7 POWER MODULE (AALA202210179898) AND P300M5 DC2 CIRCUIT CARD (AALA202210173501) PER FIM DMC-B787-A-24-00-F9-BLA-421A-A.

Part: DRIVE UNIT — FAILED (ZONE 200 - FUSE) · airframe 21,790 hrs · 2,521 cycles

AIRCRAFT WAS GROUNDED: STANDBY DC FEED CIRCUIT BREAKER TRIPPED. NO SMOKE OR FUMES. CAUSED MULTIPLE FAILURES. AIRCRAFT DIVERTED TO KEF. EMERGENCY WAS DECLARED AND WAS OVERWEIGHT FOR LANDING. FOUND MAINTENANCE MESSAGE 24-39288, CE2471823 CIRCUIT BREAKER POPPED, STANDBY DC FEED RIGHT POWER DRIVE UNIT 73 FAULTY, REPLACED RIGHT POWER DRIVE UNIT 73M6 (AALA202210179264) AND M7 POWER MODULE (AALA202210179898) AND P300M5 DC2 CIRCUIT CARD (AALA202210173501) PER FIM DMC-B787-A-24-00-F9-BLA-421A-A.

Part: DOOR TRACK — LACK OF LUBE (ZONE 900 - LAV/G) · airframe 19,530 hrs · 2,238 cycles

AIRCRAFT WAS NOT GROUNDED: LAVATORY 1F1L DOOR STICKS. LUBRICATED UPPER DOOR TRACK. CHECKS OK PER AMM 25-41-00.

Part: DOOR — LACK OF LUBE (ZONE 900 - LAV/G) · airframe 18,986 hrs · 2,161 cycles

AIRCRAFT WAS NOT GROUNDED: 1L LAVATORY DOOR STICKS WHILE OPENING AND CLOSING. LUBRICATED 1L LAVATORY DOOR IAW ESO 42288, OPS CHECK GOOD.

Part: NONE — OUT OF POSITION (ZONE 800 - DOORS) · airframe 17,919 hrs · 2,009 cycles

AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT REPORTED DOOR 1R MAKING NOISE. FOUND SIDE TRIM ON DOOR SLIDE NOT PROPERLY STOWED. RESTOWED SLIDE TRIM PER AMM 25-66-01.

Part: SLIDE — DETACHED (ZONE 800 - DOORS) · airframe 17,733 hrs · 1,970 cycles

AIRCRAFT WAS GROUNDED: 2L DOOR SLIDE DETACHED FROM DOOR. REPLACED SLIDE PER JOB CARD 25-94-01.

Part: SLIDE — INTERFERENCE (ZONE 800 - DOORS) · airframe 17,733 hrs · 1,970 cycles

AIRCRAFT WAS GROUNDED: 2L DOOR DIFFICULT TO ARM AND DISARM. FOUND SLIDE TO BE INTERFERING WITH ARMING / DISARMING. REPLACED SLIDE ASSEMBLY IAW WORK CARD 25-94-01.

Part: BOTTLE — BLOWN (ZONE 200 - FUSE) · airframe 17,733 hrs · 1,970 cycles

AIRCRAFT WAS GROUNDED: SUSPECTED 2L DOOR ASSIST BOTTLE BLEW. REPLACED 2L DOOR ASSIST BOTTLE PER AMM 52-11-22.

Part: GUIDE — MISSING (ZONE 900 - LAV/G) · airframe 17,630 hrs · 1,959 cycles

AIRCRAFT WAS NOT GROUNDED: LAVATORY 3F-1R DIFFICULT TO OPEN AND CLOSE. INSTALLED NEW DOOR GUIDE IAW CMM 25-49-85, OPS CHECK GOOD.

Part: SKIN — DELAMINATED (RT WING SLAT) · airframe 16,248 hrs · 1,762 cycles

AIRCRAFT IN BASE MAINTENANCE: DISBOND DAMAGE OF NOSE SKIN ON #9 SLAT BETWEEN WS 649.9 AND WS 796.10, MEASURING L=4.2 IN, W=0.95 IN, D=0.03 IN. ACCOMPLISHED PERMANENT REINFORCING BONDED REPAIR IAW EA 326734.

Part: CONNECTOR — LOOSE (EMERGENCY LIGHT) · airframe 15,535 hrs · 1,681 cycles

AIRCRAFT IN BASE MAINTENANCE: 3R DOOR AFT EMERGENCY PATH LIGHT INOPERATIVE. SECURED LOOSE CONNECTOR IAW AMM 33-51-03, OPS CHECK GOOD.

Part: WIRE — BROKEN (EMEGENCY LIGHTS) · airframe 15,535 hrs · 1,681 cycles

AIRCRAFT IN BASE MAINTENANCE: EMERGENCY LIGHTS INOPERATIVE AT SEATS 6D AND 6H. REPAIRED BROKEN WIRE AT CONNECTOR P21 IAW SWPM 20-30-12, OPS CHECK GOOD.

Part: LIGHT — INOPERATIVE (SEAT 6D) · airframe 15,535 hrs · 1,681 cycles

AIRCRAFT IN BASE MAINTENANCE: AFT EMERGENCY PATH LIGHT INOPERATIVE AT SEAT 6D. REPLACED LIGHT ASSEMBLY IAW AMM 33-51-06, OPS CHECK GOOD.

Part: LIGHT — INOPERATIVE (SEAT 1H) · airframe 15,535 hrs · 1,681 cycles

AIRCRAFT IN BASE MAINTENANCE: FWD EMERGENCY PATH LIGHT INOPERATIVE AT SEAT 1H. REPLACED LIGHT ASSEMBLY IAW AMM 33-51-06, OPS CHECK GOOD.

Part: LIGHT — FAULTED (SEAT 6H) · airframe 15,535 hrs · 1,681 cycles

AIRCRAFT IN BASE MAINTENANCE: SEAT 6H AFT EMERGENCY PATH LIGHT FLICKERS DURING TEST. REPLACED LIGHT WITH NEW IAW AMM 33-51-06, OPS CHECK GOOD.

Part: BATTERY — INOPERATIVE (EMERGENCY LIGHTS) · airframe 57,627 hrs · 23,832 cycles

AIRCRAFT IN BASE MAINTENANCE: EMERGENCY LIGHTS INOPERATIVE AT ROWS 24-32. REPLACED BATTERY AT WELS BATTERY UNIT 27 IAW AMM 33-51-07, OPS CHECK GOOD.

Part: CONTROL UNIT — FAULTY (EMERGENCY LIGHTS) · airframe 14,772 hrs · 1,577 cycles

AIRCRAFT WAS NOT GROUNDED. DURING ACCOMPLISHMENT OF WORKCARD 78C21033001, FOUND WELS CLASS 07 FAULT MESSAGE. REPLACED WELS WIRELESS CONTROL UNIT M3351007, IAW AMM 33-51-07. OPERATIONS CHECK GOOD.

Part: TIRE — LOW PRESSURE (NR 1) · airframe 14,345 hrs · 1,518 cycles

AIRCRAFT WAS GROUNDED. DURING TAKEOFF ROLL, BELOW 30 KNOTS ON AIRSPEED INDICATOR, "TIRE PRESS" EICAS MESSAGE. ABORTED TAKEOFF AND TAXIED BACK TO GATE. REPLACED NR 1 TIRE ASSEMBLY WITH NEW, IAW AMM 32-45-01-00A-520A AND 32-45-01-00A-720A. OPERATIONS CHECK GOOD.

Part: CONTROL UNIT — FAULTED (EMERGENCY LIGHTS) · airframe 14,138 hrs · 1,489 cycles

AIRCRAFT WAS NOT GROUNDED. ACCOMPLISHED EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK, PER TASK CARD MCM 2803. MAINTENANCE MESSAGE 33-12107 FOUND IN EXISTING FAULTS. ACCOMPLISHED FIM 33-50-F1. REPLACED WIRELESS CONTROL UNIT M3351007 AT DOOR 4 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 33-51-07.

Part: CONTROL UNIT — FAULTED (EMERGENCY LIGHTS) · airframe 14,138 hrs · 1,489 cycles

AIRCRAFT WAS NOT GROUNDED. ACCOMPLISHED EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK, PER TASK CARD MCM 2803. MAINTENANCE MESSAGE 33-12131 FOUND IN EXISTING FAULTS. ACCOMPLISHED FIM 33-50-F1. REPLACED WIRELESS CONTROL UNIT M3351033 AT OFAR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 33-51-07.

Part: WINDOW — DELAMINATED (CABIN) · airframe 12,384 hrs · 1,262 cycles

AIRCRAFT IN BASE VISIT: PASSENGER OUTER WINDOW PANE AT STA1053, S16L-S17L HAS 0.50" BY 0.25" DELAMINATION. REMOVED AND REPLACED WINDOW PANE IAW AMM DMC-B787-A-56-21-01-00B-520A-A AND AMM DMC-B787-A-56-21-01-00B-720A-A.

Part: WARNING MESSAGE — FALSE ACTIVATION (COCKPIT) · airframe 11,657 hrs · 1,179 cycles

AIRCRAFT WAS GROUNDED: PILOT REPORTS 2 HR INTO CRUISE, CABIN LIGHTS BLINKED AND SEVERAL STATUS MESSGES APPEARED AND STAYED ON THROUGH SHUTDOWN (ELEC RPDU GATEWAY 71), (ELEC RPDU 21 CHAN), (ELEC RPDU 75 CHAN), (ELEC RPDU 73 CHANNEL), (RAT DEPLOY INOP), (HYD PRESS IND PRI-L), (HYDR RESV PRESS IND-L), (HEAT AOA-L), (NO AUTOLAND), (RAM FAN CONTROL-L). MAINTENANCE REPORTS MAINTENANCE MESSAGE 24-36371 RPDU71M1 GATEWAY CIRCUIT CARD HAS NOT COMMON DATA NETWORK WITH CORRELATED STATUS MESSAGES AS WRITTEN BY FLIGHT CREW. ACCOMPLISHED FIM 24-70-F3-96A-421A CMCF SHOWS NO ACTIVE FAULT AND NO STATUS MESSAGES. PRECAUTIONARY REPLACED RPDU 71M1 GATE WAY MICROPROCESSOR M2471071M1 IAW AMM 24-71-05-00A-520A-A. ALL SYSTEM CHECKED OK.

Part: BATTERY — DISCHARGED (CABIN) · airframe 9,574 hrs · 962 cycles

AIRCRAFT WAS NOT GROUNDED: DOOR 4L EMERGENCY LIGHT WOULD NOT COME ON. MAINTENANCE REPLACED WIRELESS BATTERY UNIT PER AMM B787-A-33-51-07-01B-520A-A AND B787-A-33-51-07-01B-720A-A AND PERFORMED SATISFACTORY OPERATIONAL CHECK.

Part: CONTROL UNIT — INOPERATIVE (EMERGENCY LIGHTS) · airframe 7,647 hrs · 764 cycles

L4 DOOR EMERGENCY LIGHT WAS INOPERATIVE. MAINTENANCE REPLACED THE WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNIT AND PERFORMED SATISFACTORY OPERATIONAL CHECK.

Part: FITTING — BROKEN (LT MLG) · airframe 6,004 hrs · 610 cycles

AIRCRAFT WAS GROUNDED: FLIGHT TOOK OFF, ENGINE INDICATION AND CREW ALERTING SYSTEM HYDRAULIC LOSS. EMERGENCY DECLARED DUE TO THE COMPLETE LOSS OF THE CENTER HYDRAULIC SYSTEM. THE FIRST INDICATION RECEIVED WAS A FLAP PRIMARY FAILURE, THEN CENTER HYDRAULIC LOSS. THE NOSE GEAR RETRACTED AFTER TAKEOFF, BUT MAIN GEAR WOULD NOT RETRACT. FLIGHT DUMPED 134,000 POUNDS OF FUEL TO GET UNDER MAXIMUM LANDING WEIGHT. FLIGHT RETURNED TO PVG AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND LEFTHAND MAIN LANDING GEAR TRUCK POSITION ACTUATOR PRESSURE LINE FITTING AND PRESSURE HOSE BROKEN, C2 PUMP PRESSURE LINE BROKEN. MAINTENANCE REPLACED THE FITTING AS PER AMM 32-32-14 AND PRESSURE HOSE (SEE AALA201805219019) WITH ALTERNATIVE MPN A55952GF0215SSC PER EA PR280706A. CENTER HYDRAULIC SYSTEM SERVICED AND BLEEDED PER AMM 12-12-01-00C-200A-A AND 29-11-00-20A-231A-A. NO LEAK FOUND, TRUCK POSITION ACTUATOR TEST SUCCESSFUL PER AMM 32-32-13.

Part: HYDRAULIC LINE — BROKEN (LT MLG) · airframe 6,004 hrs · 610 cycles

AIRCRAFT WAS GROUNDED: FLIGHT TOOK OFF, ENGINE INDICATION AND CREW ALERTING SYSTEM HYDRAULIC LOSS. EMERGENCY DECLARED DUE TO THE COMPLETE LOSS OF THE CENTER HYDRAULIC SYSTEM. THE FIRST INDICATION RECEIVED WAS A FLAP PRIMARY FAILURE, THEN CENTER HYDRAULIC LOSS. THE NOSE GEAR RETRACTED AFTER TAKEOFF, BUT MAIN GEAR WOULD NOT RETRACT. FLIGHT DUMPED 134,000 POUNDS OF FUEL TO GET UNDER MAXIMUM LANDING WEIGHT. FLIGHT RETURNED TO PVG AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND LEFTHAND MAIN LANDING GEAR TRUCK POSITION ACTUATOR PRESSURE LINE FITTING AND PRESSURE HOSE BROKEN, C2 PUMP PRESSURE LINE BROKEN. MAINTENANCE REPLACED THE FITTING (SEE AALA20180517005) AS PER AMM 32-32-14 AND PRESSURE HOSE WITH ALTERNATIVE MPN A55952GF0215SSC PER EA PR280706A. CENTER HYDRAULIC SYSTEM SERVICED AND BLEEDED PER AMM 12-12-01-00C-200A-A AND 29-11-00-20A-231A-A. NO LEAK FOUND, TRUCK POSITION ACTUATOR TEST SUCCESSFUL PER AMM 32-32-13.

Part: STRUT — FAILED (RT WING) · airframe 5,100 hrs · 527 cycles

RIGHT WING TRAILING EDGE FAIRING STRUT 38 AND 37 FAILED RESULTING IN THE HINGE ATTACH BRACKET TO SEVER. REPAIRED DAMAGED ITEMS IAW EAS 278033, 277878A, AND 278093, THE AIRCRAFT WAS GROUNDED

Part: STRUT — FAILED (RT WING) · airframe 5,100 hrs · 527 cycles

RIGHT WING TRAILING EDGE FAIRING STRUT 38 AND 37 FAILED RESULTING IN THE HINGE ATTACH BRACKET TO SEVER. REPAIRED THE DAMAGED ITEMS IAW EA 278033, 277878A, AND 278093. THE AIRCRAFT WAS GROUNDED

Part: HINGE BRACKET — SEVERED (RT WING) · airframe 5,100 hrs · 527 cycles

RIGHT WING TRAILING EDGE FAIRING STRUT 38 AND 37 FAILED RESULTING IN THE HINGE ATTACH BRACKET TO SEVER. REPAIRED DAMAGED ITEMS IAW EA 278033, 277878A, AND 278093. THE AIRCRAFT WAS GROUNDED.

Part: CONTROL UNIT — FAULTY (EMERGENCY LIGHTS) · airframe 4,872 hrs · 502 cycles

AHM ALERT, CLASS 07. L4 DOOR REMOTE CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNITS. WITH FAULT CODE 33-12107. REMOVED AND REPLACED THE CONTROL UNIT IAW AMM 33-51-07. OPS CHECKED NORMAL.

Part: CONTROL UNIT — FAULTY (EMERGENCY LIGHTS) · airframe 4,872 hrs · 502 cycles

AHM ALERT, CLASS 31. REMOTE CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNITS, FAULT CODE 33-12131. RAN SYSTEM CONFIGURATION REPORT IAW AMM DMC-B787-A-33-51-00-03A-300D-A. REMOVED AND REPLACED CONTROL UNIT IAW AMM 33-51-07. OPS CHECKED NORMAL.

Part: PROBE — FAILED (TAT) · airframe 3,523 hrs · 368 cycles

LEFT AND RIGHT ELECTRONIC ENGINE CONTROL FAULTED AND TOTAL AIR TEMPERATURE PROBE HEATER FAILED. EMERGENCY DECLARED. RETURNED TO DEPARTURE, LANDING UNEVENTFUL. REMOVED AND REPLACED TAT PROBE IAW AMM 34-12-03. OPS CHECKED GOOD. AIRCRAFT WAS GROUNDED.

Part: CONTROL UNIT — FAULTY (CABIN) · airframe 3,417 hrs · 354 cycles

AIRCRAFT WAS NOT GROUNDED. AIRPLANE HEALTH MONITORING ALERT RECEIVED FOR L4 DOOR REMOTE WIRELESS EMERGENCY LIGHTS SYSTEM CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WELS CONTROL UNITS. REMOVED AND REPLACED L4 DOOR WELS CONTROL UNIT PER AMM 33-51-07. OPERATIONAL CHECK GOOD.

Part: LIGHT — FAULTED (CABIN) · airframe 2,313 hrs · 241 cycles

EMERGENCY EXIT LIGHTS AT THE L4 DOOR CAME ON AT TAKEOFF AND THEN FLICKERED 3 HOURS INTO FLIGHT, DURING CHOPPY AIR. MAINTENANCE MESSAGE 33-12131 RECEIVED. ACCOMPLISHED FIM DMC-B787-A-33-50-F1-P3A-421A-A. OPERATIONAL CHECKED GOOD.