As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3696 DURING TAKEOFF ROLL THE CREW HEARD MASTER WARNING TAKEOFF FOR THE BRAKES ON THE AURAL WARNING UNIT. THE CREW OBSERVED THE BRAKE LIGHTS NOT ON AND THE PARKING BRAKE FULLY DOWN. THE CREW ELECTED TO DO A LOW SPEED ABORT. THE AIRCRAFT WAS REMOVED FROM SERVICE. RESET ELECTRICAL POWER PERFORMED FIM TASK 31-51-00 NO DEFECTS NOTED AT THIS TIME. THE OPERATIONAL CHECK WAS GOOD. NO PARTS REMOVED OR REPLACED. THE AIRCRAFT WAS RETURNED TO SERVICE.