What was found
ON TAKEOFF FROM MEM, WITH LDG GEAR POSDET ON SYS 1, WITH LNDGGEAR HANDLE UP, LANDING GEAR INDICATED 3 GREEN TRIANGLES, 3 RED UNLOCKED LIGHTS AND NO DOOR LIGHTS ILLUMINATED. AFTER SWITCHING TO POSDET 2 AND RAISING THE HANDLE, AFTER SHORT DELAY, THE GEAR RETRACTED NORMALLY. ABLE TO DUPLICATE FAULT, REPLACED LANDING GEAR CONTROL MIRCOSWITCH (2GA) "LANDING GEAR HANDLE",ALL TEST PASS, OPS CHECK GOOD IAW AMM 32-31-11-04.