As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BATTERY PACK CAPACITY CHECK FND BATTERY PACK LOW CAPACITY ON M33409 REF HAECO NON-ROUTINE NO.9456145 - ORIGINATED BY EMP V905467, SPEC NO.B777-33-3-7019. PERFORMED BY EMP V905467,IDT BY EMP V924356,REPALCED THE BATTERY PACK ON M33409 AND TEST OK AS PER AMM 33-51-06-960-802 REV.97.