537/538 DT check found air leak fail. ~~~~~ Train leak rate 0.9bar/5min.With M2-M2 MRIC isolated. EMU 537 Leak 1bar/5min.EMU538 leak 0.9bar/5min. #3537-WSP,#1537-CR,AS,Bogie2(parking brake)#2537-AS,CR,MR test point.Replace 7nos,balance of 19 nos of test point found air leak to replace. #3538-WFL B side elbow connector loose-tightened ok. 0020 raise to follow up. Check by Saini/Haslan/Asruddin. 22/12/20 To further rectification Replace 19 nos of test point. #1538 tightened double check v/v joint.Air leak test 0.4bar/5min. Done by Saini/Haslan/Zulq. 23/12/20