As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT SQUAWKED GRINDING NOISE WHEN AILERON WAS MOVED UP AND DOWN. WHEN TROUBLESHOOTING, FOUND NOISE COMING FROM SERVO. WHEN OPERATING ON THE GROUND, LIGHT WOULD COME ON AND HORN WOUULD GO OFF SAYING THAT AUTOPILOT WAS DISENGAGED, EXCEPT SERVO OUT AT WING WAS STILL ENGAGED. SOLENOID FOR AUTOPILOT TO DISENGAGE AND ENGAGE STICKING.