What was found
MAIN LANDING GEAR INDICATORS STAYED GREEN ON GEAR UP SELECTION, ACCOMPLISHED NORMAL AND ABNORMAL CHECKLIST. THE PROBLEM PERSISTED. FLIGHT RETURNED TO HOME BASE. NO OTHER DIFFICULTIES OCCURRED THROUGHOUT THE FLIGHT. FURTHER INSPECTION FOUND 3 WAY SELECTOR VALVE ASSY NOT SEATED PROPERLY. LUBED SELECTOR LEVER, CYCLED SEVERAL TIMES AND PERFORMED LANDING GEAR EXTENSION/RETRACTION SEVERAL TIMES IAW SHORTS MM. OPERATIONAL CHECK VERY GOOD. AIRCRAFT RELEASED FOR SERVICE WITH NO FURTHER TROUBLE. (M)