As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE OPERATIONS CHECKING THE ACFT EMERGENCY LIGHTS, IT WAS NOTED THAT THE LT AISLE OVERWING EXIT LIGHT WAS INOPERATIVE. AFTER TROUBLESHOOTING IT WAS DETERMINED THAT THE BATTERY PACK HAD FAILED. NEW BATTERY PACK HAS BEEN ORDERED & WILL BE REPLACED.