As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION THE ALL OF THE EMERGENCY LIGHTS THAT OPERATE OFF OF BATTERY NR 4 WERE FOUND TO BE INOPERATIVE. MAINTENANCE R & R THE NR 4 BATTERY PACK, OPERATIONALLY TESTED WITH NO DEFECTS NOTED, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.