What was found
NOSE GEAR WOULD NOT RETRACT AFTER T/O. RECYCLED, NO LUCK. ALL RED AND GREEN LIGHTS ON N/G WERE ON WITH HANDLE IN UP POSITION. ALL GEAR LOCKED DOWN NORMAL WITH HANDLE DOWN. FERRIED FROM MDW TO CVG WHERE LANDING GEAR SOLENOID VALVE, NOSE GEAR RESTRICTOR VALVE AND NOSE GEAR SEQUENCE VALVES WERE CHANGED RESULTING IN NORMAL OPERATIONAL CHECKS ON JACKS. SOLENOID VALVE (S/N 738) TT 15662. RESTRICTOR VALVE (S/N 425) TT 15662. SEQUENCE VALVES (S/N 1738) TT 15662. SEQUENCE VALVES (S/N 1540) TT 14239.