As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX FLIGHT NR 2444: LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF. THREE GREEN, THREE RED, AMBER HANDLE LIGHTS ALL ILLUMINATED WITH GEAR SELECTED UP. MAINTENANCE REMOVED AND REPLACED NLG WOW2 CENTERING HARNESS IAW 32-21-11-000-401 AND 32-21-400-401, TR NR 32-203. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.