As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED MAIN ROTOR VIBRATION. INSPECTION REVEALED YELLOW STAR ARM BUSHING DE-BONDED AND MOVED OUTBOARD. FURTHER INSPECTION REVEALED CRACK UNDER BUSHING IN COMPOSITE MATERIAL. PART LASTED 90.5 HOURS AND IS LIFE LIMITED AT 2,220 HOURS. PREVIOUS PART LASTED ONLY 673.4 HOURS AND HAD A SIMILAR FAILURE.