As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THROUGH THE MID 20’S ENROUTE, RECEIVED AN AUTO PITCH TRIM CAUTION MESSAGE MULTIPLE TIMES. FOLLOWED CHECKLIST AND DISENGAGED THE AUTOPILOT. RECEIVED MAIN PATCH TRIM WARNING MESSAGE. RETURNED TO DEPARTURE, DECLARED AN EMERGENCY ABD LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. R & R STAB ACTUATOR IAW AMM 27-40-02. OPS CHECKED GOOD. ACFT RETURNED TO SERVICE.