TC feedback train experienced hard jerk while braking at platform.Fault occurred since BDK2. ~~~~~ DOENLOAD ER FOUND 1641 BCP ABNORMAL AT BRAKING.FC 113 PROPULSION BRAKE DEMAND FAILURE.DURING BRAKE CYCLIC TEST FOUND 1641 BCP COAST TO B3 SLOW TO APPLY.C/O ACU 2641 AND SWAP 2641 ACU TO 1641.BRAKE CYCLIC TEST OK.BCP OK.TEH/GANESAN/JIMMY/RAGHU 01.10.2023 ACU SWAP 1641- 1434-020 TO 2641 - 1528-129 ACU C/O  2641 OLD  1434-020 NEW  1511-1091 NOTIFICATION 2528456