As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT ON CLIMB, RIGHT ENGINE WOULD NOT LEAN OUT. PILOT THEN TURNED BACK TO AIRPORT AND AN UNEVENTFUL LANDING WAS MADE. PILOT THEN DISCOVERED RIGHT ENGINE WOULD NOT SHUT DOWN WHEN MIXTURE CONTROL WAS PULLED BACK TO IDLE CUT-OFF. UPON INSPECTION BY MAINTENANCE, RIGHT ENGINE MIXTURE CABLE WAS FOUND WITH END PULLED OUT OF SWAGE AT FUEL CONTROL END. (X)