DT533/534 UNDERSHOOT 533/534 UNDERSHOOT @ 1224HRS 12/12/2020 ROM RS LOGS, OBSERVED ABNORMAL BCP AT 2533. A ~~~~~ DT533/534 UNDERSHOOT     #2533-No fault code.ER show abnormal BCP.Found ACU slow in release,replace ACU and brake cyclic test-ok. #2534 found stuck brake.0020 raise to follow up. ACU-Old s/n: 1038-064  New s/n: 1301-122 Not: 2228853 raise to RSW. Done by Zulq/Saini/Koh/Asruddin. 13/12/20 2534 BCU fault, FC3303/331/308/312 #2534-FC: 330/331/308/312.Replace ACU and brake test ok.No ACU leak.BCP within criteria.No reoccurance of fault. ACU-Old s/n: 1032-043  New s/n: 1042-070 Not: 2228852 raise. Done by Saini/Asruddin/Koh. 13/12/20