As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR EXTENSION ON APPROACH THE CREW RECEIVED AN ICAS MESSAGE AMBER "OTBD BRAKE FAIL". THEY LANDED WITHOUT ANY ISSUES. IN TROUBLESHOOTING THE PROBLEM WE FOUND THE BRAKE CONTROL UNIT HAD FAILED ON THE OTBD SIDE. REPLACED BRAKE CONTROL UNIT AND NO FURTHER PROBLEMS.