As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW RECEIVED A RIGHT HAND OVERWING EMERGENCY EXIT CAS MESSAGE AND RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REINSTALLED THE RIGHT HAND OVERWING EMERGENCY DOOR IN ACCORDANCE WITH BOMBARDIER AIRCRAFT MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.