As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL, TAKEOFF WARNING HORN SOUNDED. TAKEOFF WAS ABORTED WITHOUT INCIDENT. RESET FLAP TRIM. SECOND TAKEOFF WAS SUCCESSFUL. REPLACED THE LEADING EDGE SWITCHES S311 AND S312 AND RIGGED FOLLOW-UP DRUM. PERFORMED TAKEOFF WARNING TEST. CHECKED OK.