What was found
STRONG VIBRATION AND A LOUD NOISE FROM THE NOSE GEAR AREA, AFTER TAKEOFF. FLIGHT RETURNED TO SDF AND LANDED WITHOUT INCIDENT. FOUND BOTH NOSE GEAR DOOR CABLES AND BINDING AT PIVOT POINTS, CAUSING CABLE TO CATCH ON DOOR LINK AND BINDING DOORS. ADJUSTED LEFT CABLE PIVOT POINT ON DOOR AND RELACED RIGHT NOSE GEAR DOOR DUE TO DAMAGE INCURRED. OPERATIONAL CHECK OK ON GEAR RETRACTION TEST. AIRCRAFT RETURNED TO SERVICE.