As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORM EMERGENCY LIGHT BATTERY PACK CAPACITY FUNCTIONAL CHECK F OUND L/H DOOR 4 BATTERY M33407 POOR CAPACITY - ORIGINATED BY EMP V905497 ON HAECO NR 9450522, SPEC NO.B777-33-3-7015. DOOR 4 L/H M33407 BATTERY REPLACED AND PERFORM OPERATIONAL TEST FOUND ''OK'', AS PER AMM 33-51-06-960-802 REV 92A.