What was found
PDIS 583 32-10 9710 14FEB20 IND OPEN AFTER DEPARTING KDTW AND SELECTING THE GEAR HANDLE UP, THE GEAR FAILED TO RETRACT WHICH WAS VERIFIED ON BOTH THE PRIMARY AND SECONDARY INDICATIONS. COMPLIED WITH QRH PROCEDURE WHICH RESULTED IN GEAR SAFELY DOWN/LOCKED, THEN WHEN DIRECTED TO RAISE THE GEAR AGAIN PER THE QRH, THE PRIMARY AND SECONDARY INDICATIONS SHOWED ALL 4 GEAR FAILED TO RETRACT. DIVERTED TO KIND REF FIM 32-30-01-01 AND WDM 32-63-01 PG 1 CHECKED GEAR HANDLE SWITCH S1-431 AND FOUND WIRE 2-20 DISCONNECTED FROM SWITCH. SO WE WILL CHANGE THE SWITCH PERFORMED MULTIPLE SUCCESSFUL GEAR SWINGS IAW MD11 AMM 32-31-00-5. PERFORMED PSEU FUNTIONAL TEST IAW MD11 AMM 31-71-01-2, TEST PASSES AND NO FAULTS IN PESU. OPS CHK NORMAL OK FOR SVC.