As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3576: AFTER GEAR RETRACTION, THE NOSE GEAR RED UNSAFE LIGHT REMAINED ILLUMINATED. ALSO, THE RIGHT AMBER DOOR LIGHT REMAINED ILLUMINATED. MAINTENANCE INSPECTED, FOUND AND REPLACED DEFECTIVE NOSE GEAR DRAG STRUT PROX SENSOR. THE GEAR WAS CYCLED SEVERAL TIMES, ALL OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.