As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 399 LGA-MCO, AFTER LANDING GEAR RETRACTION ECAM BRAKES AUTO BRK FAULT BRAKE RELEASED. BRAKES ON WHEEL 3 & 4 (PAIR 2) BOTH RELEASED WHILE BRAKING OVER 20 KNOTS. REMOVED AND REPLACED BSCU (BRAKE STEERING CONTROL UNIT) 10GG IAW AMM 32-42-34. OPS CHECK SATISFACTORY.