As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)AIRCRAFT EXPERIENCED HUNTING WHEN AUTOPILOT WAS SELECTED. LATER INVESTIGATION FOUND THE BEARING MS276404 WAS BROKEN IN PIECES AND LYING IN THE EMPENAGE. SUBMITTER NOTES THE DIFFICULTY IN INSPECTING THIS LOCATION AND ACCESS HAD TO BE G AINED THROUGH SMALL INSPECTION PANEL LOCATED IN THE EMPENAGE.