What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING PUSH BACK, THE MESSAGE IN EICAS AND STATUS AUTO BRAKE SYSTEM FAIL AND AUTO BRAKE / BRAKE NUMBER 7. MAINTENANCE PERSONNEL PERFORMED FIM DMC-B787-A-32-40-F1-U7A-421A-A PROCEDURE, NO CONFIRMING FAILURE AND THE MESSAGE OF AUTO BRAKE DISAPPEAR. THE BRAKE NUMBER 7 WAS DEFERRED IAW MEL 32-45-01 CAT. C. AT MEX, THE BRAKE NUMBER 7 WAS REPLACED IAW DMC-B787-A-32-45-07-00A-520A-A, TESTED CORRECT AND THE REPORT WAS CLOSED.