DT545: UNDERSHOOT S LOGS SHOWED TRAIN OVERSHOOT MULTIPLE TIMES C LOGS OBTAINED AND OBSERVED RESIDUAL BRAKE PRESSURE IS OUT OF SYNC. FER TO RS TO CHECK ON BCP. ME OF FAULT: 2157hrs, 2226hrs, 2245hrs, 2301hrs, 2306hrs ~~~~~ ER downloaded - found FC308, 312, 331, 332) Found 2545 B1 to coast slow to release. Replaced ACU and function tested ok.  /FAIRUZ/01.04.22