As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER SUPPLY AND BATTERY FOUND MALFUNCTIONED. REPLACED THE R4 DOOR EMERGENCY POWER SUPPLY AND BATTERY PACK. PERFORMED THE NEW POWER SUPPLY AND BATTERY PACK TEST. THE TEST RESULT NORMAL IAW AMM 33-51-06-960-802 AND AMM 33-51-06-960-803 REV 104.