As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TRIMMED OUT AT STRAIGHT AND LEVEL FLIGHT NEARING DESTINATION THE ACFT BEGAN A SERIES OF UNCOMMANDED YAWS IN BOTH DIRECTIONS AND PROGRESSIVELY GOT MORE NOTICEABLE UPON DESCENT TO LANDING EVEN WITH AUTOPILOT ENGAGED AND DISENGAGED.