As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN OVERNIGHT LINE CHECK THE EMERGENCY ESCAPE PATH LIGHTING IN THE AFT SECTION OF THE PAX CABIN WAS FOUND TO BE INOPERATIVE. MX FOUND THE ASSOCIATED BATTERY PACK TO BE DEFECTIVE AND REPLACED IT. ALL OPS CHECKED GOOD AFTER REPLACEMENT.