As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
B777-33-3-7019 B2 INT: DOOR 4 LEFT (CENTER M33406) EMERGENCY LIGHT BATTERY FAILED OPERATIONAL AND BITE TEST. P/N OFF: D717-01-100 S/N OFF: 434082 REPLACED DOOR 4 LEFT EMERGENCY LIGHT BATTERY PACK M33406 AND WORK ACCOMPLISHED BY V943538 INSTALLATION TEST PASSED AS PER AMM 33-51-06. P/N ON: D717-01-100 S/N ON: 512768