What was found
AFTER TAKEOFF, PILOT ATTEMPTED TO SELECT THE MAIN LANDING GEAR TO THE UP POSITION. THE GEAR HANDLE WOULD NOT SELECT UP. PILOT RETURNED TO KENAI WITHOUT INCIDENT. AFTER INSPECTING THE AIRCRAFT, MAINTENANCE PERSONNEL FOUND THAT THE CIRCUIT BREAKER FOR THE LANDING GEAR SOLENOID HAD FAILED. THIS SOLENOID PREVENTS THE RETRACTION OF THE MAIN LANDING GEAR WHEN THE AIRCRAFT IS ON THE GROUND. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE CIRCUIT BREAKER PER MM AND OPS CHECKED LANDING GEAR SYSTEM. RETURNED AIRCRAFT TO SERVICE.