TC reported train came to a stop in AM at tk cct W716 with brake fault at RM2 car. Fault self cleare d and train able to proceed in AM to jur mt. Fault was inter mittent. ~~~~~ #2687 Check and found ACU solenoid port heavy air leak all position. Replaced ACU. Brake cycle test ok. ACU-Old s/n: 1541-182  New s/n: 1541-187. Not: 2134366 raise to RSW. Done by Jack/Sateesh/Koh. 24/02/20.