TIMS showed BCU fault at front M1 car. TC informed fault cleared when train departed ORC SB. Train p erformance - ok. ~~~~~ TIMS showed BCU fault at front M1 car. T     Check Tims observed FC 308/330/331 brake cyclic no observed any abnormal.Further check found PBSV internal air leaking and cause parking brake intermittent slow released,B13 V/V check ok.Replace PBSV and parking brake function test ok.Brake cyclic ok.BCP within criteria,to be further monitoring. Done by Sanip/Koh. 23/06/21