As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LLAR EMERGENCY LIGHT POWER SUPPLY BATTERY FAILED - ORIGINATED BY EMP V905307 ON HAECO NR 9460012, SPEC NO.B777-33-3-7024. PERFORMED BY EMP V905450,LLAR EMERGENCY LIGHT POWER SUPPLY BATTE RY PACK REPLACED, INSTALLATION TEST PERFORMED FOUND NORMAL, REF TO AMM 33-51-06-960-802 REV 93.