As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING THE ACCOMPLISHMENT OF THE EMERGENCY LIGHTING SYSTEM EMERGENCY POWER SUPPLY UNIT 10WL FAULT DISPLAYED. MAINTENANCE REPLACED THE R1 DOOR SLIDE PER TASK CARD 26L00025011 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM.