As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE COPLIYING WITH MAIN ROTOR MAST NUT TORQUE CHECK IT WAS DISCOVERED THAT THE NUT HAD LOST SIGNIFICANT TORQUE. THE TORQUE WRENCH USED FOR THIS CHECK WAS SET AT MINIMUM TORQUE VALUE. THE ROTOR HUB SHAFT WAS REMOVED TO INSPECT THE SPACER TUBE ASSY. THE PROJECTIONS ON THE ASSEMBLY WERE WORN BEYOND THE ALLOWABLE LIMITS OF .21IN.