As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR 4R EMERGENCY LIGHTING POWER SUPPLY M33409 BATTERY LOW CAPACITY DURING CAPCITY CHECK REFER HAECO NON-ROUTINE NO.9450732 ORIGINATED BY EMP V903172,SPEC NO.B777-33-3-7019 PERFORMED BY EMP V903172 ON HAECO NON-ROUTINE LP9450732,REPLACED THE DOOR 4R EMERGENCY LIGHT POWER SUPPLY M33409 BATTERY AND OP TEST CARRIED OUT,FOUND NORMAL AS PER AMM 33-51-06-960-802 REV 97 IDT BY TA409