As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APPROXIMATELY 30 MINUTES AFTER TAKEOFF, STABILIZER TRIM MESSAGE ON ENGINE INDICATING CREW ALERT SYSTEM, NO CHANGE WITH AUTO PILOT ON/OFF. ATTEMPTED TO RESET MESSAGE DISAPPEARED MOMENTARILY, THEN FAULT REOCCURRED. AIRCRAFT RETURNED TO TORONTO. CHANGED HORIZONTAL STABILIZER TRIM ACTUATOR AND MOTOR CONTROL UNIT, OPERATION CHECKED NORMAL.