As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)IN FLIGHT, THE CYCLIC CONTROL STARTED GETTING STIFF, ACCOMPANIED BY A GROWLING NOISE FROM MAIN GEARBOX AREA. AFTER HYDRAULIC PUMP WAS REMOVED IT WAS FOUND THAT A BEARING HAD FAILED. NOTE THIS PUMP HASHAD A PREVIOUS HISTORY OF PREMATURE FAILURE.