As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - FLIGHT 2300 - THE CREW RETURNED TO FIELD, WHEN AFTER TAKEOFF, THE GEAR WOULD NOT RETRACT ONCE THE GEAR LEVER WAS SELECTED UP. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE NUMBER 2 NOSE LANDING GEAR WOW HARNESS. GEAR RETRACTION TESTS WERE PERFORMED AND CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.