As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT ROUGH IN HOVER AND CLUNKING NOISE HEARD ON SHUTDOWN. INSPECTION SHOWED INCORRECT SHIMMING OF STATIC STOPS ALLOWING FITTING TO ROTATE IN BORE OF YOKE WHICH POUNDED ONTO STATIC STOP, DAMAGING STATIC STOP. PROSEAL FOUND INSIDE YOKE ON RADIUS RINGS AND FITTINGS. SUBMITTER STATED SHOULD NOT BE ANY PROSEAL.