As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED CAPACITY CHECK, BATTERY PACK PN/61-2275-1 SN/9801233 FAILED ON 8/7/04 AND 8/11/04. MAINTENANCE REPLACED BATTERY ASSEMBLY PN 61-2274-1. UNIT PASSES CMM CHECKS. RETURNED TO SERVICE 8/17/04. REFER TO WO NR 373759 FOR ADDITIONAL INFORMATION.