As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
M/D R4 DOOR AFT EMERGENCY POWER SUPPLY M33409 BATTERY PACK FOUND LOW CAPACITY. REPLACED THE M/D R4 DOOR AFT EMERGENCY POWER SUPPLY M33409 BATTERY PACK AS PER AMM 33-51-06-960-802 REV 103, PERFORMED THE NEW BATTERY PACK INSTALLATION TEST AS PER AMM 33-51-06-960-802 REV 104.PERFORMED THE NEW BATTERY PACK CAPACITY AS PER AMM 33-51-06-200-801 REV 104,TEST RESULT NORMAL.