As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT TAKEOFF WAS ABORTED DUE TO WARNING HORN SOUNDING IN COCKPIT. AIRCRAFT WAS GROUND RUN AND TAKEOFF WARNING SYSTEM WAS CHECKED IN DIFFERING CONFIGURATIONS IAW MAINTENANCE MANUAL PROCEDURES. NO DEFECTS WERE FOUND AND AIRCRAFT WAS RELEASED FOR SERVICE.