As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - ABORTED TAKEOFF - FLT 0137 - WHEN PREPARING TO TAKEOFF FROM PHX EN ROUTE TO LAS THE TAKEOFF WARNING CONFIGURATION HORN SOUNDED WITH SPOILERS, FLAPS, TRIM AND BRAKES ALL IN THE PROPER POSITION. MAINTENANCE PERFORMED A WARNING SYSTEM TEST, CHECK WAS GOOD.