What was found
ORD - FLT 559 - AFTER TAKEOFF ORD, EN ROUTE TO IAH, UNABLE TO RAISE LANDING GEAR GROUND/FLIGHT CONTROL ALERT ON MFDU. ALSO, RECEIVED LIFTED FAULT MESSAGE ON MFDU. RETURNED AND LANDED ORD WITHOUT INCIDENT. ADJUSTED RIGHT AIR/GROUND INBOARD 3 SENSORS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)