TC reported train was jerky before traincome to a complete stop at station in AM. For all stations since AMK1. TC proceeded in ATPM from ADM1- WDL1, and feedba ck fault still recurred. ~~~~~ 3570 TC reported train was jerky before train come to a complete stop at station in AM. For all stations since AMK1. TC proceeded in ATPM from ADM1- WDL1, and feedback fault still recurred.  3570 no signs of stuck brake/propulsion no command in ER. From ER, found that train speed was fluctuating moderately at +/-40kph & +/-60kph. Verified with S&C that this was due to TSR imposed on Mainline (track circuit N861 at 40kph, track circuit N867 at 60kph). Postulate that ATO system on train was attempting to maintain train speed by alternating between braking & accelerating. Checked braking & propulsion relays, found no abnormalities. During brake cycle check, made a side finding of brakes on #3570 not being able to fully release. (Refer to M/O 11705343 for more details).  Jonathan Koh 45089 M/O 11705343 (OPS 10) 3570 - Brakes not able to fully release when MCH at coast.  3570 ACU swapped to #3569. Checked/confirmed all brakes were not released at COAST. MR pressure at 0.25 bar. OPS 20 raised to replaced ACU on #3569.  Irwan/Tarmidzi/Faiz/Hashim 45089 ACU S/N : (after swapped) #3570 : 1812/814 #3569 : 1003 001 (OPS 20) To replace ACU  3569 FC 308/331/330. Replaced ACU, function check & brake cyclic test - OK. Checked/found no air leak & no residual pressure at COAST. Brakes were able to release at COAST. Limited movement/depot shunting - OK.  Sarma/Alan/Sugu/Anand/Kamarul 45090 #3569 ACU S/N :    OLD : 1003 001 NEW : 1311/060