As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INNER BEARING ON TAIL ROTOR PITCH CHANGE MECHANISM, INNER RACE IS SPINNING ON THE SHAFT CAUSING BEARING ASSY TO WEAR INTO THE SHOULDER ON THE PITCH CHANGE ASSY. THE RESULT WAS THE BEARING ASSY WAS MIGRATING INBD ON THE PITCH CHANGE ASSY.