As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE INSPECTION FOUND THE LEFT REAR OVERWING EXTERIOR EMERGENCY LIGHT INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE BATTERY PACK NR 4 CHARGER IAW AMM 33-50-04. THE OPERATIONAL CHECK WAS GOOD ON CHARGER AND EXTERIOR LIGHTING. THE AIRCRAFT WAS RETURNED TO SERVICE.