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 (M33406) ABOVE DOOR L3 FAILED TEST. REMOVED AND REPLACED L3 EMERGENCY LIGHT POWER SUPPLY PACK PER 33-51-06-960-802. OPERATIONAL CHECK SATISFACTORY AMM 33-51-06-960-802.