What was found
THE NOSE GEAR RED LIGHT REMAINED ON WHEN GEAR WAS EXTENDED FOR LANDING ON APPROACH TO IAH. THE GEAR WAS MANUALLY EXTENDED AND THREE GREEN LIGHTS WERE INDICATED. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NLG SAFETY SENSOR AT FAULT. THE NLG SAFETY SENSOR WAS REMOVED AND REPLACED IAW MM 32-09-02, PAGE 401. THE NOSE GEAR WAS RETRACTED SEVERAL TIMES WITH OPERATION AND INDICATIONS CHECKING GOOD.