As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN OHAR EMERGENCY LIGHT FAILED TO OPERATION DURING PERFORM EMERGENCY LIGHT CAPACITY CHECK REFER HAECO NON-ROUTINE LP.947384 0 - SPEC NO.B777-33-3-7019 CABIN OHAR EMERGENCY LIGHT POWER PACK BATTERY M9429 REPLACED AND INSTALLATIONN TEST CARRIED OUT RESULT NORMAL, AS PER AMM 33-51-06-960-802 REV.99.