As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C CHECK THE OVERWING LIGHTS BECAME IN-OPERATIVE. MAINTENANCE REMOVED AND REPLACED EMERGENCY BATTERY SUPPLY NR 4 AND PERFORMED OPERATIONAL CHECK, OPERATIOANL CHECK WAS GOOD IAW EMB 135 AMM 33-50-04. THE AIRCRAFT WAS APPROVED TO RETURN TO SERVICE.