As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOBRAKES WORKED FINE TIL TOP OF DESCENT, WITH GEAR HANDLE NEUTRAL TRIED TO ARM (MED) AUTOBRAKES. GREEN PN CAME ON FOLLOWED IMMEDIATE W/AUTO BRAKES INOP. TRIED SEVERAL RESETS. GOC DIRECTED KMSP RETURN DUE TO SHORT DLH RWY. BSCU SHOWED CODE FOR ALT SERVO VALVE. BOX WOULD NOT RESET. REMOVED AND REPLACED BSCU IAW A310-200 AMM 32-42-72-4 AND OPS TESTED IAW 32-42-00-5. ITEM REMAINS ON DEFERRAL DUE TO HISTORY. ACN RELEASED FOR SERVICE IAW MEL/CDL: 32-42-05.