As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF THROTTLES WERE ADVANCED TO 70-80 PERCENT N1 WITH BRAKES APPLIED (AIRCRAFT NOT MOVING) BRAKES RELEASED AND POWER ADVANCED TO TAKEOFF THRUST. AUTO THROTTLES WERE ENGAGED AND MAX TAKEOFF POWER SET, THEN SEVERAL SECONDS LATER DURING 30-40 KIAS THE TAKEOFF WARNING HORN SOUNDED. ABORTED TAKEOFF PRIOR TO 80 KIAS. CYCLED STAB TRIM TAKEOFF WARNING TEST AS PER 31-21-00 OPS CHECK OK.