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 LIGHT AT DOOR 4L WAS FOUND TO BE INOPERATIVE. MAINTENANCE FOUND THE ASSOCIATED POWER SUPPLY (M737) TO BE DEFECTIVE AND REPLACED IT. SYSTEM OPERATION WAS GOOD AFTER THE POWER SUPPLY WAS REPLACED.