As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL OF THE MAIN ROTOR HEAD ASSY, FIVE PRESSURE BOLTS WERE NOTED OF HAVING A LOSS OF TORQUE PRIOR TO REMOVAL. AFTER REMOVAL OF THE MAIN ROTOR HEAD ASSY, AND FURTHER INSPECTION, DAMAGE WAS FOUND TO THE LOWER CONICAL RING AND TO THE LOWER CONICAL RING SEAT ON THE MAST. DAMAGE TO THE CONICAL RING SEAT MEASURED .680 IN X .172 IN AND THE DEEPEST PIT MEASURING 0.019 IN. (0.48MM)