DT568 UNDERSHOOT 568 UNDERSHOOT FAULT. BASED ON OUR INVESTIGATION FROM RS LOGS, WE SCOVERED SOME ABNORMALITIES ON THE BCP. CAN RS HELP US TO CHECK ON P1 <(>&<)> BCP2 ~~~~~ DT568 UNDERSHOOT     #2568-FC 330,331,308 #2568-When B3 to Coast & B1 to Coast,ACU slow release.ACU abnormal air purge from exhaust port.Replace ACU brake cyclic test ok.ACU no abnormal purging,shunting BCP within criteria. ACU-New s/n: 1301-122 Old s/n: 1042-075 Not: 2297072 raise to RSW. Done by Joshua/Zulq  21/07/21