As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) VIBRATION REPORTED. ROTOR HEAD DISMANTLED. AT THE ATTACHMENT POINT OF THE HUB TO THE MAST, THE BEARINGS (A-106-5 AND A-648-1) AS WELL AS THE RINGS (A-152-1) WERE EXCESSIVELY WORN. THE TWO BEARINGS (A-648-1) WERE OUT OF ROUND TO THE EXTENT OF DAMAGING THE M/R HUB (A-154-1) BEYOND REPAIR.