TC reported TIMS showed brake fault present at front M1 car and 'BCU unit health fault'. Train perfo rmance - ok. ~~~~~ TC reported TIMS showed brake fault pres     #1569 FC-308/330/331 Check ACU brake cyclic test no abnormalities.Found PBSV heavy leak from exhaust,swap PBSV to #2569.PBSV still leak from exhaust.Replace #1569 PBSV and check ok.No occurance leak.Brake cyclic test ok,BCP within criteria.Swap CP #1569/#2569 function test ok.BCP within criteria. PBSV-Not: 2394590 raise. Done by Haslan/Din/Johari.  28/06/22