TC reported intermittent BCU fault at rear DT car. Train performance - ok. ~~~~~ 3677 TC reported intermittent BCU fault. Train performance - ok.  3677 replaced BCU. Checked all brakes are physically released when at 'COAST'. Checked brake pressure - OK (refer to attached checklist). No W/S/S & #3677 all tacho - OK.  Alan/Shafie 44523 #3677 BCU S/N : OLD : 1548327 NEW : 1513167