As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND THE BATTERY POWER SUPPLY P/N 11-0049 S/N 17155 AND THE BATTERY HOLDER ASSEMBLY P/N 11-0049 EMERGENCY LIGHTS WOULD NOT TURN ON. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE BATTERY POWER SUPPLY AND THE BATTERY CHARGER. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.