3546 TC feedback train encountered BCU f ~~~~~ 3546 TC feedback train encountered BCU fault. Found 3546 intermittent BCU fault with wheel s/s, wsp active axle 1 ON.  3546 FC D/L. Checked/found Tacho #1 resistance fluctuating. Replaced Tacho #1 & resistance check - OK.  Chan GF/Alan 44440 #3546 Tacho #1 S/N : OLD : 89001 NEW : 99/0002