As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WHILE ACCOMPLISHING L3 SLIDE REMOVAL PER TASK CARD 26L00025012 MAINTENANCE FOUND EXTERIOR LIGHT FAULT ON 15WL EMERGENCY POWER SUPPLY UNIT. MAINTENANCE ISOLATED THE SOURCE OF THE FAULT TO THE L2 DOOR SLIDE AND REPLACED IT. A SATISFACTPORYT OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WAS ACCOMPLIHED WITH NO FAULTS NOTED.