As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE. BATTERY FOR EMERGENCY LIGHT POWER SUPPLY (M33401) ABOVE DOOR R3 FAILED TEST. REMOVED AND REPLACED BATTERY PACK FOR EMERGENCY LIGHT POWER SUPPLY IAW AMM 33-51-06-960-802. OPERATIONAL CHECK SATISFACTORY PER AMM 33-51-06-960-802.