As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLT 2091 - EN ROUTE DFW/PDX - NOSE GEAR RED LIGHT STAYED ON WITH GEAR HANDLE UP AFTER TAKEOFF. LIGHT EXTINGUISHED 30 MINUTES INTO FLIGHT. REPLACED NOSE GEAER UPLOCK SENSOR. PERFORMED GEAR RETRACTION CHECK. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)