As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT THE RT PROPELLER WENT TO FEATHER UNCOMMANDED ON TAKEOFF ROLL. UPON ARRIVAL BY MX, THE ENGINE WAS INSPECTED WITH NO DEFECTS NOTED. AS A PRECAUTION, R & R RIGHT PROP GOVERNOR. GROUND RAN LT AND RT ENGINES WITH ALL PARAMETERS OPERATIONALLY CHECKED OK.