As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSTALLATION OF GOVERNOR, THE TOP MOUNTING STUD FOR THE GOVERNOR PULLED FROM THE GEARBOX AND PARTIALLY THROUGH THE GOVERNOR HOUSING. THE STUD PULLED THROUGH BEFORE NUT REACHED THE CORRECT TORQUE OF 70-85 INCH POUNDS. REPLACED HELICOIL IN ACCESSORY GEARBOX. REPLACED MOUNTING STUD AND REPLACED GOVERNOR.