1670 underframe air leak noise during DT ~~~~~ 1670 underframe air leak noise during DT     #1670 Check and found ACU EM solenoid heavy air leak.Replaced ACU and function check brake cycle test are ok. ACU-Old s/n: 1549-214  New s/n: 1439-027 Not: 2145654 raise to RSW. Done by Jack/Sateesh/Koh  29/03/20