What was found
AFTER TAKEOFF, THE CREW ATTEMPTED TO MOVE THE LANDING GEAR HANDLE TO THE UP POSITION. HANDLE FAILED TO MOVE ALL THE WAY TO THE UP POSITION. CREW FOLLOWED PROCEDURES IN THE QUICK REFERENCE HANDBOOK AND RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX REMOVED AND REPLACED THE K3 RELAY IN THE LANDING GEAR ACCESSORY UNIT AND ALSO REMOVED AND REPLACED THE S106 LANDING GEAR AIR SAFETY SENSOR IAW AMM 32-09-200. THE LANDING GEAR OPS CHECKED SATISFACTORY IAW AMM 32-32-0 AND 32-33-0 AND ACFT RETURNED TO SERVICE.