2517 DT check having BCU release fault. ~~~~~ #2517 FC 308,312,331.Brake cyclic test & found ACU air leak from exhaust port.Replaced ACU & brake cyclic test ok.BCP within criteria. ACU-New s/n: 1032-038  Old s/n: 1037-055 Not: 2189893 ACU-New s/n: 1042-071  Old s/n: 1032-038 (ACU hunting B2 & EM) Not: 2189895 Done by Zulq/Arsuddin.    17/08/20