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 LIGHTS AT ROWS 21ABC, 24ABC, 25DEF WERE FOUND TO BE INOPERATIVE. MAINTENANCE FOUND POWER SUPPLY MODULE M10954 TO BE DEFECTIVE AND REPLACED IT AND THE BATTERY PACK. THE SYSTEM OPERATED NORMALLY AFTER THE POWER SUPPLY MODULE AND BATTERY PACK WERE REPLACED.