As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EMERGENCY POWER SUPPLY UNIT 10WL FAULT MESSAGE DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED THE R1 DOOR SLIDE AND ACCCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMEMRGENCY L;IGHTING SYSTEM WITH NO FAULTS NOTED.