As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED A CYCLIC STICK AND MAIN ROTOR VIBRATION. IT WAS FOUND THAT THE SPINDLE BEARINGS WERE ROUGH. AFTER DISASSEMBLY THE INNER SPACER (P/N A155-1) WAS FOUND TO BE SEVERELY CORRODED AND PITTED. THE PART LOOKED TO HAVE BAD MACHINING. THE BEARINGS BECAME ROUGH DUE TO THE METAL OFF THE SPACER.