TC reported Rear M1 car brake fault whentrain approaching MSP Siding B. Fault self-clear. ~~~~~ T214 3540 TC reported brake fault at 1539  car when train approaching MSP Siding B. Fault self-cleared. Stock change over of train was arranged at AMK.  1539 FC 308/330/331. During depot shunting no fault. Brake cyclic test check ACU found ticking sound at AF solenoid AT B3/B2/B1. Replace ACU and function test ok. BCP within criteria. Depot shunt ok. OLD:1310-141 NEW:1037-055 Notif CSC:2548111 Done by Saini/Zulq 45263