TIMS showed BCU duplex dump vaule 2 fault at car 3554. Brake on local light up and brake off local l ight up. Train performance - ok. TIMS showed BCU duplex dumpvaule 2 fault at car 3554. Brake on local light up and brak  ~~~~~ 3554 TIMS showed BCU duplex dump valve 2 fault. Brake on local light up and brake off local light up. Train performance - ok. CE : 3554 BCU duplex dump faulty unable to reset.  3554 ER D/L & found FC 309/315/318/319. Checked dump v/v 1 & 2 pin connection resistance - OK. Replaced BCU & set wheel diameter to 805mm. Brake cyclic test & brake pressure test - OK. No residue pressure at COAST. Limited movement/depot shunting - OK. Brake ON/O  indication & parking brake check - OK.  Sarma/Anand 44916 #3554 BCU S/N : OLD : 1827112 NEW : 1810078