As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS IN BASE MAINTENANCE: EMERGENCY BATTERY PACK M33093 AT L1 DOOR FAILS CAPACITY CHECK. REMOVED AND REPLACED EMERGENCY BATTERY PACK M33093 AT L1 DOOR, INSTALLATION TEST AND CAPACITY CHECK GOOD. PER B777 AMM 33-51-06-960-802, AMM 33-51-06-200-801.