As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LANDING GEAR HANDLE WOULD NOT RISE PAST THE OFF POSITION. CREW USED OVERRIDE TO RAISE GEAR. WARNING HORN SOUNDED WITH FLAPS UP, PRESSURIZATION AND ALL OTHER INDICATIONS NORMAL. DIVERTED TO PHX AND MADE AN UNEVENTFUL LANDING. FOUND DEFECTIVE AIR/GROUND SENSING PROXIMITY SWITCH. REPLACED SWITCH AND PERFORMED GEAR RETRACTION TEST PER BOEING M/M.