Train undershoot platform in Auto mode.Proceeded in ATPM mode to the headwall. TC reported intermit tent brake fault at front M1 car. ~~~~~ Train undershoot platform in Auto mode.     #1602  Found BCP stuck at 3 bar when 750v cut off,heavy air leak from ACU exhaust port.(Solenoid v/v mod 3) Replaced ACU and fuction tested ok. ACU-New s/n: 1528-134  Old s/n: 1439-025 Not: 2188783 raise to RSW. Done by Faddzal/Sanip. 13/08/20