TC feedback TIMS showed BCU fault at rear M2 car. Train performance - ok. ~~~~~ TC feedback TIMS showed BCU fault at rea   Checked and confirmed FC300 and FC308. Checked brake pressure and found brake pressure maintain at 0.27 during coasting. Checked and found ACU leaking. ACU replaced. N.AHASZHAN/01.03.21 --------------------- To replace 2565 ACU.   ER confirmed brake pressure higher when undershoot occurred. Possibly causing train to undershoot. ACU was replaced on the same car. N.AMUTALIB/02.03.21 ---------------------