As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AP1/YAW TRIM FAILED ON AP TEST DURING START RUN-UP. A TEST FLIGHT EVAL REVEALED AP1 AND TRIM APPEAR ON CAD, "Y" APPEARS ON PFDS, AND "YAWTRI PFTINH" APPEARS ON VEMD SYSTEM STATUS PAGE AFTER AUTO PILOT TEST FAILS. REMOVED AND REPLACED YAW TRIM ACTUATOR; TEST FLIGHT SUCCESSFULLY COMPLETED.