What was found
ORD - INFLIGHT AFTER TAKEOFF NOSE GEAR OR DOORS WOULD NOT RETRACT. NOSE LANDING GEAR INDICATION WAS DOWN FLUSH BUT VERY LOUD AIRFLOW DISRUPTION AROUND COCKPIT. RED NOSE GEAR INDICATION AND TWO GREENS ON THE MAINS. CYCLED GEAR WITH SAME INDICATIONS. GOOD DOWN AND LOCKED INDICATION. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. OUT OF SERVICE TO HANGAR FOR EVALUATION. REPLACED NOSE TURNING TUBE AND PISTON ASSEMBLY. SERVICED STRUT WITH NO LEAKS NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION.