DT found 2559 brake pressure at 0.30 bar ~~~~~ DT found 2559 brake pressure at 0.30 bar when put to coast. To check and rectify     #2559 check and found ACU port air leak when at coast.Replaced ACU and function check ok.Brake cycle test are ok. ACU-Old s/n: 1008-004,New s/n: 1012-016 Not: 2155145 raise to RSW. Done by Kumar/Jack/Sateesh. 28/04/20