During DT found EMU 559/560 Air leak Test fail 1.2bar/5mins, To rectify. ~~~~~ During DT found EMU 559/560 Air leak Test fail 1.2bar/5mins, To rectify.  Check and found multiple car test point heavy leak, c/o done.    3560 wiper pipe line filter element air leak, changeout done. 2559 LMRG pipe joint air leak.Tighten ok. 3559 water tank pipe joint air leak. Tighten ok. Final air leak test 0.5b/5min Done by Rizman/Koh/Jack 45435