As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE. EMERGENCY LIGHT POWER SUPPLY (M33405) BATTERY PACK FAILED ON CAPACITY CHECK. REMOVED AND REPLACED EMERGENCY LIGHT POWER SUPPLY PACK PER AMM 33-51-06-960-802. OPERATIONAL CHECK SATISFACTORY PER AMM 33-51-06-960-802.