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 FOUND BATTERY PACK LOW CAPACITY ON M33097 REF HAECO NON-ROUTINE NO.9452854 - ORIGINATED BY EMP V905467 SPEC NO.B777-33-3-7019. PERFORMED BY EMP V905467,IDT BY EMP V924356.REPLACED THE BATTERY PACK ON M33097 AND TEST OK AS PER AMM 33-51-06-960-802 REV 97.