As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PERFORMED A MAIN ROTOR DAMPER TIMING TEST, WE HAVE FOUND THE DAMPER TO FAIL. UPON FURTHER INVESTIGATION IT WAS REMOVED DUE TO EXCESSIVE OIL LEAKAGE. THE DUST BOOT WAS REMOVED AND FOUND THAT THE PISTON WAS UNDERSIZED WHEN MEASURED IAW THE O/H MANUAL SA-4045-83, REV 22.