As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED OF RECEIVING A MACH TRIM FAIL CAS MESSAGE DISPLAYED IN FLIGHT. OPERATIONS WERE CONTINUED ON MEL 22-20-01. DURING THE MAINTENANCE EVENT THE MAINTENANCE TEAM TROUBLESHOT THE MACH TRIM SYSTEM AND FOUND THE MACH TRIM ACTUATOR TO BE INOPERATIVE. REMOVED THE INOP ACTUATOR AND REPLACED IT WITH AN OVERHAULED UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.