As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE FLIGHT CREW NOTICED THAT THE NOSE GEAR RED AND GREEN LIGHTS STAYED ON AFTER GEAR RETRACTION. THE AIRCRAFT WAS REROUTED. A NORMAL LANDING WAS MADE. ADJUSTED NOSE GEAR POSITION SENSOR IAW MM. OPS CHECK NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE.