DT533/534 UNDERSHOOTCHECK ON 3534 AND 1534 CAR, ABNORMAL BCP OBSERVED FROM LOGS. ~~~~~ DT533/534 UNDERSHOOT     Check Tims no observed any BCU fault.Further check found #1534 ACU control pressure transmitter faulty-c/o ok. Also found #2534 ACU hunting during coast position when EB applied.ACU c/o done.Function brake test ok.BCP within cateria. #2534-ACU:               #1534-CP Transmitter Old s/n: 1912-157          Not: 2210497 New s/n: 1032-043 Not: 2210495 Done by Koh/Faddzal/Firdaus   15/10/20