As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CUSTOMER COMPLAINED OF EXCESSIVE VIBRATION. ATTEMPTS TO BALANCE THE PROP WERE UNSUCCESSFUL. INSPECTION REVEALED THAT THE EXHAUST SUPPORT (LEVER ASSY) SUPPORT BUSHINGS WERE WORN ALLOWING THE METAL PORTION TO CONTACT THE MOUNT TRANSMITTING THE ENGINE VIBRATION TO THE AIRFRAME.