What was found
DFW - FLT 0641 - EN ROUTE EWR/DFW, RED NOSE GEAR LIGHT ILLUMINATED IN CLIMB PASSING 18,000 FEET. ACCOMPLISHED ABNORMAL PROCEDURES WITH NO EFFECT. LIGHT EXTINGUISHED 15 MINUTES LATER AT 28,000 FEET. LANDED DFW WITHOUT INCIDENT. REPLACED UP/DOWNLOCK SENSOR ON NOSE GEAR. ACCOMPLISHED GEAR SWING. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)