What was found
CVG - FLT 1467 - EN ROUTE BUF-ORD, SHORTLY AFTER TAKEOFF NOSE LANDING GEAR FAILED TO RETRACT. RED NOSE RED LANDING GEAR LIGHT ILLUMINATED ACCOMPANIED BY AURAL WARNING SIGNAL. AFTER SEVERAL MINUTES HEARD A LOUD NOISE FROM NLG AREA. DIVERTED CVG AND LANDED WITHOUT FURTHER INCIDENT. REPLACED NLG SHRADER VALVE ASSY. SERVICED NOSE LANDING GEAR. NO LEAKS NOTED. SYSTEM CHECKED NORMAL OPERATION. (M)