Train stopped with stuck brake indication at Rear M2 car after arriving YCK2. STBS operated. Pax dis embarked at AMKMT. ~~~~~ Downloaded ER and fault trace on PTU006. From ER observed #2611 encountered stuck brake 3 bar. Fault code: 308, 330 and 331. Found 2611 ACU faulty causing stuck brake. Replaced ACU and carried out brakes cyclic/function test ok.    ACU-Old s/n: 1576-108  New s/n: 1549-214. Not: 2146899. Done by Jack/Sateesh/Koh. 02/04/20.