As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND EMERGENCY LIGHT BATTERY PACK LOW CAPACITY AT M33404 REF HA ECO NON-ROUTINE NO:9491233 - ORIGINATED BY ,SPEC NO.B 777-33-3-7015. PERFORMED BY, REPLACED THE BATTERY M33404 AND NEW BAT TERY PACK TEST FOUND NORMAL AS PER AMM 33-51-06-960-802 REV 101, WDM 33-51-66 REV 78.