As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, CREW REPORTED THAT THE AUTO-PILOT WOULD NOT DISENGAGE THROUGH NORMAL MEANS. AUTO PILOT AND ELECTRIC TRIM (ELEVATOR) CIRCUIT BREAKERS WERE PULLED TO DISCONNECT AUTO-PILOT. MAINTENANCE INSPECTED AIRCRAFT AND AUTO-PILOT FUNCTIONED NORMALLY, BUT FOUND THE ELECTRIC TRIM SERVO TO BE BAD. MAINTENANCE REMOVED AND REPLACED ELECTRIC TRIM (ELEVATOR) SERVO.