2555 - ACU HEAVY LEAK ~~~~~ 2555 ACU HEAVY LEAK.  2555 checked/found ACU having air leakage. Found air leakage from VLCU exhaust passage. Replaced ACU & function check - OK> Brake cyclic test - OK. No residue pressure at COAST & no air leak. Limited movement/depot shunting - OK.  Sarma/Anand/Alan 44904 #2555 ACU S/N : OLD : 1301/125 NEW : 1042/073