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 IN FLIGHT. INSPECTED Z-ARIS MOUNTS AN FOUND THE LT REAR AND LT FORWARD, Z-ARIS MOUNTS IN UNSERVICABLE CONDITION. REMOVED AND REPLACED Z-ARIS MOUNTS. PERFORMED TRACK AND BALANCE OF MAIN ROTOR. NO FURTHER DEFECTS NOTED.