As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT RT PROP INCREASED RPM BEYOND THE RED, BY ITSELF, HAD NO CONTROL OF RT PROP. ALSO RT PROP WOULD NOT FEATHER. PERFORMED AN AIR RETURN & LANDED WITH NO FURTHER INCIDENT. INSPECTED THE RT PROP CONTROL, REPOSITIONED PROP GOVERNOR CABLE. R & R PROP GOVERNOR IAW MM CHAPTER 61-20-00. OPERATIONS CHECKED GOOD WITH NO FURTHER DEFECT NOTED.