As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKE OFF WARNING HORN SOUNDED ON TAKE OFF. ABORTED TAKEOFF. COULD NOT SILENCE HORN. THOROUGHLY CLEANED AND INSPECTED MICRO SWITCHES, FOUND 3151-S3, (TAKE OFF WARNING HORN ON NR 1 PCL) DEFECTIVE - REPLACED MICRO SWITCH. TAKE OFF WARNING HORN SOUNDED WITH TAKE OFF POWER, ABORTED TAKE OFF, RE CHECKED ALL TAKEOFF ITEMS, ALL OK. FOUND SWITCH 3151-S3 ACTUATOR TAB BENT. ADJUSTED TAB OPS CHECK GOOD.