As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKEOFF WARNING HORN SOUNDED DURING POWER UP AND TAKEOFF WAS ABORTED AT 10 KTS. WARNING HORN ITEMS CYCLED AND SOUNDED AGAIN ON SECOND ATTEMPT. FOUND UPPER STAB TRIM SWITCH STICKING. CLEANED AND LUBED SWITCH. TAKEOFF WARNING TEST NORMAL.