As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 4082 REPORTED HAVING THEIR BETA WARNING HORN SOUND WITH LOSS OF NORMAL BRAKING WHEN POWER LEVERS WERE SELECTED BELOW FLIGHT IDLE DURING GROUND HANDLING. IT WAS DETERMINED THAT THE BETA WARNING HORN SYSTEM WAS AT FAULT, SYSTEM WAS MEL'D AND DEACTIVATED. ALL SYSTEMS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.