As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW RECEIVED A MACH AND STAB TRIM AMBER CAS MESSAGE AND RETURNED TO GSO. MAINTENANCE THEN DISPATCHED MECHANICS FROM DAY. MAINTENANCE THEN RETRIEVED CODES FROM THE MDC AND RESET THE HSTCU AND PERFORMED A FUNCTIONAL TEST WHICH WAS GOOD IN ACCORDANCE WITH BOMBARDIER AIRCRAFT MAINTENANCE MANUAL 27-40-00. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.