As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING JOB CARD 2735 BATTERY POWER RESTORATION TEST FOUND DOOR 1L FORWARD BATTERY PACK, WOULD NOT PASS TEST. MAINTENANCE REPLACED BATTERY PACK (EMERGENCY POWER SUPPLY UNIT) PER AMM 33-51-06 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.