DC reported 3550 with brake faulr,unable ~~~~~ DC reported 3550 with brake faulr,unable     #3550 ACU faulty-replaced and function check ok.Brake cycle test are ok. old s/n: 1236-040  New s/n: 1037-021 Not: 2126648 raised to RSW. Done by Jack/Satessh/Koh. 02/02/20