As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, NOTICED RT REAR ENGINE MOUNT BRACKET RIVETS WERE LOOSE. AFTER REMOVAL OF ENGINE, FOUND BOTH REAR MOUNTS WERE CRACKED AT FORWARD EDGE OF REAR SUPPORT MEMBER. TOTAL TIME OF AIRCRAFT WAS A CONTRIBUTING FACTOR, BUT EXTRA CARE SHOULD BE USED WHEN INSPECTING THIS AREA. POSSIBLE ROTATING OR REPLACING OF LORD MOUNTS WOULD HAVE HELPED THIS PROBLEM.