As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2436: LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF, RAN CHECK LIST. NO FIX. GEAR INDICATED 3 GREEN AND 3 RED WITH HANDLE UP. 3 GREEN WITH HANDLE DOWN. MAINTENANCE REMOVED AND REPLACED NLG WOW 2 HARNESS IAW Q400 AMM 32-21-11-000-801 AND 32-21-11-400-801 AND TASK CARD 6071001. OPS CHECK GOOD. PERFORMED GEAR SWING IAW Q400 AMM 32-31-00-867-801. AIRCRAFT RETURNED TO SERVICE.