As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED VIBRATIONS IN THE CYCLIC DURING AUTO ROTATIONS. THE MAIN ROTOR SPINDLE BEARINGS WERE INSPECTED AND FOUND TO BE BRINELLED. THE SPINDLE BEARINGS WERE REPLACED 34.5 HOURS PRIOR TO THIS EVENT. SEE SDR UNIQUE CONTROL #8HBR20220730046