As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CAPACITY INSPECTION IN MSP, EMERGENCY POWER SUPPLY P/N 3301-51, S/N 2085 REMOVED FOR SCHEDULED CAPACITY CHECK, CAPACITY CHECK FAILED. MAINTENANCE REPLACED BATTERY ASSEMBLY P/N 3301-31 & UNIT PASSES CMM CHECKS. RETURNED TO SERVICE 10/13/04.