TC reported constant air discharge noisefrom leading DT car. MR pressure maintained at 9 bar. ~~~~~ TC reported constant air discharge noise     #3653 found micromesh filter hand v/v not fully tightened.Check filter ok no sign of water or oil.Purge out MR,BSR,ASR ok,no sign of water.Tightened up hand v/v checked a few times no reoccurance of air leak.Air dryer both DT side ok. #3653 air compressor-cut in 8.6,cut out 10.2bar.Charging time-1min & 44sec. #3654 air compressor-cut in 8.7,cut out 10.35bar.Charging time-2min & 08sec. Air leak 0.3bar/5min. Done by Zulq/Asruddin. 05/06/22