What was found
(CAN) AFTER TAKEOFF, WHEN GEAR HANDLE SELECTED UP, GEAR DISAGREE WARNING MESSAGE, WOW INPUT CAUTION MESSAGE, NOSE DOOR OPEN, STEERING INOP MESSAGE. CREW DECLARED AN EMERGENCY AND RETURNED TO CVG, COMPLETING AN UNEVENTFUL LANDING. THE NOSE STRUT WAS SERVICED AND A/C RETURNED TO SERVICE.