As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON THREE OCCASIONS WITH AUTOPILOT ENGAGED AND AIRCRAFT FLYING STRAIGHT AND LEVEL, AUTOPILOT COMMANDED A RAPID PITCH FORWARD ON THE CONTROL COLUMN AND THEN RETURNED TO NORMAL, NEUTRAL POSITION. NR 1 VERTICAL GYRO REPLACED AND AIRCRAFT RETURNED TO SERVICE.