As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FAULT MESSAGE ESCAPE SLIDE LT/ESPU (12WL) EXT R. DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED R3 DOOR ESCAPE SLIDE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WITH NO FAULTS NOTED.