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, BATTERY SUPPLY P/N 3301-501, S/N 1458 REMOVED FOR FOR SCHEDULED CAPACITY CHECK, CAPACITY CHECK FAILED. MAINTENANCE REPLACED BATTERY ASSEMBLY 3301-31 & UNIT PASSES CMM CHECKS. RETURNED TO SERVICE 09/29/04.