As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT 2455: LANDING GEAR FAILED TO RETRACT. RAN CHECKLIST. CHECKED ALL DOORS AND CB'S, ALL WERE IN. WITH THE GEAR HANDLE UP, ALL THREE GREENS REMAINED ON WITH THE RED UNSAFE LIGHTS AND THE GEAR HANDLE ILLUMINATED. AIRCRAFT RETURNED TO FIELD. MAINTENANCE REMOVED AND REPLACED THE WOW NR 2 NOSE CENTERING HARNESS. PERFORMED LANDING GEAR EXTENSION AND RETRACTION SYSTEM TEST. CHECKS GOOD. NO OTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.