TC reported TIMS showed intermittently rear DT car BCU fault WSP #02 timeout. TC feedback train perf ormance as per normal. No other fault indications. ~~~~~ TC reported TIMS showed intermittently r     Checked and confirmed multiple occurrence of WSP timer 1 & 2 activated (time out) for #3566.Measured tachogen 1 to 4 resistance reading ok.Replaced #3566 BCU and set wheel diameter. Security check ok.Brakes cyclic/function test ok. Done by Faddzal/Deeshan. 17/05/21