As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUR BOLTS THAT SECURE THE MAIN ROTOR STARFLEX TO THE MAIN ROTOR MAST WERE FOUND BROKEN DURING TROUBLESHOOTING OF AN OUT-OF-BALANCE CONDITION WITH THE MAIN ROTOR SYSTEM. THERE ARE A TOTAL OF 12 BOLTS IN THE SYSTEM. AN ADDITIONAL 3 BOLTS FAILED WHEN THE SYSTEM WAS BEING DISASEMBLED. ALL OF THE BOLTS IN THE MAST WERE FOUND SEVERELY CORRODED.