As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2351 - THE FLIGHT RETURNED TO FIELD AFTER TAKEOFF, THE GEAR FAILED TO RETRACT WHEN SELECTED. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE NOSE GEAR ELECTRICAL HARNESS. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.