As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNIT FAILED ON WING SCHEDULED CAPACITY CHECK. BATTERY POWER SUPPLY PN 3301-31 SN/2009 BATTERY FAILED CAPACITY CHECK ON BENCH. MAINTENANCE REMOVED AND REPLACED BATTERY ASSEMBLY PN 3301-31. UNIT PASSES CMM CHECKS, RETURNED TO SERVICE 5/7/2004.