What was found
THE NOSE GEAR RED UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION DEPARTING MFE. THE GEAR WAS CYCLED, BUT THE LIGHT DID NOT EXTINGUISH. THE FLIGHT CONTINUED TO IAH WHERE IT LANDED WITHOUT INCIDENT. THE NLG RETRACT ACTUATOR WAS REPLACED BASED ON THE REPORTED FAULT. THE GEAR WAS SWUNG, AND THE PROBLEM WAS DUPLICATED. THE NLG CYLINDER WAS REMOVED AND REPLACED. THE GEAR WAS SWUNG SEVERAL TIMES WITH OPERATION AND INDICATIONS CHECKING GOOD.