What was found
AIRCRAFT WAS GROUNDED. WHILE ACCOMPLISHING JOB CARD 26L00025012 FOR DOOR L2 SLIDE RE INSTALLATION, OPERATIONAL CHECK OF EMERGENCY POWER SUPPLY UNIT FAILED BUILT IN TEST EQUIPMENT CHECK WITH FOLLOWING FAILURES, ATA 33-51-38. EMERGENCY POWER SUPPLY UNIT BATTERY MID RIGHT, EMERGENCY POWER SUPPLY UNIT BATTERY MID LEFT, EXIT RIGHT, AFT LEFT AND EMERGENCY POWER SUPPLY UNIT COM EXIT LEFT. RETEST OF SYSTEM ONLY REVEALS BATTERY FAULTS AT MID LEFT 15WL AND AFT LEFT 13WL. REPLENISHED CEILING EXIT SIGN BULBS AT 15WL (AALA202012139002) AND 13WL (AALA202012149013), AS REQUIRED AND REPLACED BATTERIES AT 15WL AND 13WL (AALA202012149015), PER AMM 33-51-38-401.