As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. DURING TAKEOFF ROLL, THE TAKEOFF WARNING HORN SOUNDED & THE PSEU LIGHT ILLUMINATED. TAKEOFF ABORTED AT UNSPECIFIED SPEED. FOUND THE PSEU SPEED BRAKE LIGHT ILLUMINATED. CLEARED FAULT & PERFORMED SPEED BRAKE OPERATIONAL CHECK. SYS CHECKED NORMAL.