As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE VISIT ALL EMERGENCY EXIT AND FLOOR LIGHTS FOUND TO BE INOPERATIVE. BLOWN FUSES FOUND IN AFT BATTERY PACK. AFTER FUSES WERE REPLACED IT WAS DISCOVERED BATTERY PACK WAS BAD. AFT BATTERY PACK REPLACED. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.