As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN DOOR OPEN CAS MESSAGE DISPLAYED AFTER SHUTTING MAIN CABIN DOOR. WHILE ON THE PHONE WITH MAINTENANCE, WE WENT THROUGH THEIR PROCEDURE AND OUR PROCEDURE WITH NO SUCCESS. WE THEN SHUT EVERYTHING DOWN PULLED THE BATTERIES WAITED 30 SECONDS TURNED EVERYTHING BACK ON, MESSAGE REMAINED. CHECK DOORS MESSAGE ALSO DISPLAYED. CORRECTIVE ACTION: RESET CABIN DOOR SYSTEM REF. PILOT CHECKLIST 3-510-28. OPERATED DOOR SEVERAL TIMES IN REF. TO CE680A M/M. 52-10-00 NO DEFECTS NOTED.