TIMS showed BCU unit healthy fault at car 3539. Train performance - ok. TIMS showed BCU unit healthyfault at car 3539. Train performance - ok. ~~~~~ TIMS showed BCU unit healthy fault at ca     Tims show BCU fault permenant.Check FC-327-BCU speed probe 4 faulty.FC-322/323-BCU wsp timer 1 & 2 activated(time out)Further check tacho gen 4 found high resistance,c/o ok. BCU c/o and wheel diameter setting (830)mm done.BCU fault cleared. #3539-Tacho Gen 4:- Old s/n: 1027127 New s/n: 0411 015 Not: 2473107 raise. Done by Rizman/Sanip/Koh.  24/03/23