What was found
GOING OUT OF DSM LANDING GEAR WOULD NOT COME UP, CONTINUED ON TO MDW STILL NO GEAR UP. PILOT LEFT AIRCRAFT IN MDW. MAINTENANCE JACKED AIRCRAFT TO SWING GEAR COULD NOT DUPLICATE PROBLEM. MAINTENANCE THEN CLEANED AND LUBED SQUAT SWITCHES, SWUNG GEAR SEVERAL TIMES, COULD NOT GET IT TO MALFUNCTION. RELEASED FOR SERVICE.