What was found
AIRCRAFT WAS GROUNDED: WHILE ACCOMPLISHING R1 SLIDE CHANGE THE OPERATIONAL TEST OF EMERGENCY LIGHTING SYSTEM. FAILED CIDS FAULTS EMERGENCY POWER SUPPLY UNIT INT LOAD EXIT R AND L. OCCURRED. **SUPPLEMENTAL REPORT FOR AALA202111027863: MAINTENANCE APPLIED EXTERNAL POWER TO THE AIRCRAFT, PUSHED THE TEST EMERGENCY LIGHTING SYSTEM BUTTON AND LET THEM STAY ON THEN UNPLUGGED THE CONNECTORS OF THE EMERGENCY POWER SUPPLIES, WAITED 10 SECONDS AND RECONNECTED THE CONNECTOR THE POWER SUPPLIES. UNPUSHED THE TEST EMERGENCY LIGHTING SYSTEM BUTTON AND PUSHED IT BACK IN AGAIN TO RESET THE POWER SUPPLIES FAULT CLEARED AND A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED ** (CLOSED)