What was found
IAH - FLIGHT 3412, THE CREW REPORTED THAT THE NOSE GEAR SYSTEM B-TRANSIT / UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE PLACED THE INDICATION ON MEL 32-60-1 CAT B CONTROL NUMBER 012105, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. THE AIRCRAFT RETURNED TO IAH ON 04/02/01 WHERE MAINTENANCE REMOVED AND REPLACED THE B-SYSTEM NOSE LANDING GEAR PROXIMITY SWITCH. REMOVED THE MEL, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.