As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT KSAN T/O WARNING HORN SOUNDED WHEN THRUST ADVANCED FOR T/O. T/O ABORTED. CYCLED CONTROL SURFACES AND STAB TRIM INDIVIDUALLY. NO HORN AFTER SPEED BRAKE WAS CYCLED. THEN OPS NORMAL. DEPARTURE UNEVENTFUL. OPS CHECK T/O WARNING PER 31-26-00. OPS CHECK SATISFACTORY.