As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE VISIT FOUND THE OVERWING EMERGENCY LIGHT TO BE INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 4 BATTERY AND CHARGER. DETERMINED NO FIX AFTER REMOVING AND REPLACING THE NR 4 BATTERY AND BATTERY CHARGER. REPINNED CONNECTOR P8503 PINS 7 & 9 AND REPLACED THE BATTERY CHARGER. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.