As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LAYOVER CHECK, MX FOUND THE EMERGENCY EXIT LIGHT AT DOOR 1R TO BE INOPERATIVE. A BLOWN FUSE (F1 ON POWER SUPPLY M731) WAS IDENTIFIED AND THE POWER SUPPLY WAS REPLACED. AFTER REPLACEMENT OF POWER SUPPLY ENTIRE FIRST CLASS AISLE EMERGENCY LIGHTS WENT INOPERATIVE DUE TO A WIRE SHORTED AT 3CD. REPAIRED THE FAULTY WIRING IAW WDM AND LIGHTS NOW OPERATE NORMAL.