IMDC:T258 EMU 641/642 reported both cab ~~~~~ #3641 Water tank c/o. IMDC:T258 EMU 641/642 reported both cab     #3642 Check side glass and tank no leak,only no water,top up water and test found both side wiper water hole blockage.Clear hole by compress air and test ok. #3641 found water tank side glass crack-c/o done and found water tank edge crack cause water dripping slowly,Wiper function test ok.Ops 0020 raise for water tank c/o. Done by Rizman/Sanip/Koh. 22/03/23