What was found
THE NOSE GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION DEPARTING IAH. THE GEAR WAS LOWERED AND THE GREEN LIGHT CAME ON. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE X DIMENSION ON NLG STRUT LOW. A FULL STRUT SERVICE WAS PERFORMED IAW MM 32-21-02. THE GROUND SHIFT CHECKED GOOD. A RETRACT TEST WAS PERFORMED AND THE NLG WAS CYCLED SEVERAL TIMES WITH OPERATION CHECKING GOOD.