As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CUSTOMER REPLACED 7 RIVETS FROM THE TAIL ROTOR TRANSMISSION SUPPORT BECAUSE THE VIBRATIONS AFTER TAIL ROTOR BEARINGS FAILED IT WAS AT 1347.8HRS .70 HOURS LATER THEY HAVE 2 MISSING RIVETS, BOTH RIVETS COME APART IN DIFFERENT TIMES AFTER THE INSTALLATION, TOTAL TIME NOW IS 1419.7HRS THE HELICOPTER DOES NOT HAVE A TAIL ROTOR VIBRATION. (TC# 20190709013)