Train encountered rear M2 stuck brake indication. TC put to standby - fault clear. ~~~~~ #2651 Found ACU air leaking from solenoid v/v. Replaced and tested ok. ACU-New s/n: 1538-164  Old s/n: 1516-107. Not: 2118111 Raise to RSW. dONE BY Kamal/Yusof/Saini/Din. 07/01/20.