As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOS FLIGHT NR 2396: AFTER DEPARTING MSO, LANDING GEAR FAILED TO RETRACT. LANDING GEAR FAIL TO RETRACT CHECKLIST ACCOMPLISHED. RETURNED TO FIELD. NO OTHER DEFECTS NOTED (PG 2-11-9) E/ABNORMAL CHECKLIST. MAINTENANCE REMOVED AND REPLACED NLG WOW 2 HARNESS IAW Q400 TASK 32-21-11-400-801 AND HORIZON EA 6-32-360 AND BOMBARDIER CSL 84-32-021. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.