As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN CARRY OUT EMERGENCY LIGHT POWER SUPPLY CAPACITY CHECK FOUND R4 DOOR M33408 POWER PACK FAILED REF HAECO NR NO.9459678 - ORIGINATED BY EMP V903179, SPEC NO.B777-33-3-7019. PERFORMED BY EMP V903179, IDT BY EMP V903189, R4 DOOR M33408 BATTERY PACK REPLACED AND OP TEST FOUND NORMAL REF AMM 33-51-06- 960-802 REV.98.