As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE LANDING GEAR WOULD NOT RETRACT, THE LANDING GEAR HANDLE WOULD NOT MOVE UP. ACCOMPLISHED AIR TURNBACK TO DSM, AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED LANDING GEAR CONTROL UNIT IAW CESSNA 650 MM CHAPTER 32-30-01. OPERATIONAL CHECK OF SYSTEM GOOD IAW CESSNA 650 MM CHAPTER 32-30-01.