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 AT R5 DOOR FAILS CAPACITY CHECK. MAINTENANCE REMOVED, REPLACED AND PERFORMED INSTALLATION TEST AND CAPACITY TEST GOOD AT BATTER PACK M33408 R5 DOOR IAW B777-3 AMM 33-51-06-960-802 AND AMM 33-51-06-200-801.