As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN TURNING FREEWHEEL ROUGHNESS WAS DETECTED, FURTHER INVESTIGATION REEALED A CLICKING NOISE. THE MAIN ROTOR TRANS. INPUT ADAPTER FREEWHEEL UNIT WAS REMOVED. THE FREEWHEEL UNIT WAS DISASSEMBLED, A BEARING THAT SUPPORTS THE INNER/OUTER COUPLING WAS DETERMINED TO BE THE CAUSE.