As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND THREE SHEARED RIVETS ON ANTI-VIBRATION ASSEMBLY. DURING REMOVAL FOR 600HR INSPECTION. ALL PARTS ARE CAPTURED AND THERE WAS NO RISK OF DEPARTURE IN FLIGHT BUT THE FAILURE HAS NOT BEEN OBSERVED AND IS UNCOMMON. AVA BASE WAS REPLACED WITH A NEW PART AND THE AIRCRAFT WAS RETURNED TO SERVICE.