As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INVESTIGATION OF PROP RPM PROBLEM, IT WAS NOTED THE RPM INDICATION AT FULL THROTTLE WAS ONLY 2100 RPM. GAINED ACCESS TO THE GOVERNOR AND NOTED THE SPEED LEVER SHAFT WAS LOOSE AND THE END HOUSING CRACKED 360 DEGREES AROUND ITS BASE. NOTE: THIS HOUSING IS MADE OF PLASTIC.