As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT WAS HOVERING, WHEN SUDDENLY THE RPM STARTED TO OVERSPEED. RPM CONTROL WAS MINIMIZED WITH THROTTLE INPUT UNTIL AN UNEVENTFUL LANDING WAS AFFECTED IN A NEARBY BALLFIELD. REPLACED GOVERNOR WITH A SERVICEABLE UNIT AND RECTIFIED THE PROBLEM.