As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DAILY INSPECTION, MECHANIC NOTED FREEWHEELING UNIT STAYED ENGAGED WHEN MOVING MAIN ROTOR FORWARD OR BACKWARD. CONDITION WAS VERIFIED BY PERFORMING AUTO-ROTATION DURING OPS CHECK FLIGHT. MAIN GEARBOX TO BE REPLACED IAW MANUFACTURER.