As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PILOT DISENGAGES ON APPROACH IN ALL MODES AND DURING TURNS. ALSO, IN STRAIGHT FLIGHT, YOKE JERKS RT AND LT ROUTINELY ABOVE MACH .78. FOUND THE RUDDER SERVO MOTOR, AUTOPILOT TO BE FAULTY. REMOVED AND REPLACED THE AUTOPILOT RUDDER SERVO MOTOR WITH AN OVERHAULED SERVO IAW G200 CMP 221008. COMPLIED WITH THE AUTOPILOT FLIGHT DIRECTOR FUNCTIONAL TEST IAW G200 CMP 224010 WITH NO DEFECTS NOTED.