As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING COUPLING REPLACEMENT (BENDIX TO KAMATIC), IT WAS NOTED THAT THE TAIL ROTOR DRIVESHAFT TO COUPLING BOLTS WERE TOO LONG AND IF ALLOWED TO REMAIN IN SERVICE WOULD CONTACT THE COUPLING WEB AND SET UP STRESS RISES.THE BOLTS CALLED OUT IN THE IPC ARE THE SAME FOR EITHER COUPLING. THE INSTALLATION INSTRUCTIONS DO NOT MENTION CHANGING THE BOLTS TO PREVENT THIS FROM HAPPENING.