ECB activated at front M2 car due to smoke from undercarriage. Pax disembarked at CBR SB. TC informe d BCU fault at the front M1 car at KTB SB. TC operated STBS and proceeded to BSD. Spare train launched from BSD. ~~~~~ [L3 FYI] [Pending Spare] ECB activated at 2642 car due to smoke from undercarriage. Pax disembarked at CBR SB. TC informed BCU fault at the 1642 car at KTB SB. TC operated STBS and proceeded to BSD. Spare train launched from BSD.  From ER, 1642 BCP signal was lost at time of fault. In depot failt permanent at car 1642 w tims showing brake fault and brake unable to be released. Swapped 1642 to 2542, fault transferred. BCU were swapped back. TIMS: 6:47H 1642 FC308, 314, 330, 331, 315 6:58H 1642 FC721 ER: 1642 BCP signal lost from 6:47 Checked wheel with signs of heat damage. Vibration damper melted. To change out wheel set. To replaced 1642 BCU. Done by: Kumar. 21.06.2024 #1642 to follow up BCU c/o. L3 #1642 BCU c/o done and fault clear. Ops30 to follow up brake function test. Old:1541274 New:1442052 Noti:2610488 Done By:Jack/Koh Date:22/06/2024 #1642 to follow brake function test N 1642 function test brake operation all able brake able to release - ok. Done: Imran, Firas, Kamal. 22/06/2024.