Diagrams for the Bosch SMV53M00GB/01Parts

Hi Paul, please could you assist me? I have a Bosch SMV53M00GB/01 and need to know which part to order.The fault is this an integrated bosch SMV53M00GB/21. After pressing start it runs the pump and empties any water (I've added water to check the pump is working and it is) - it then sounds like water is going in, but it isn't - I've checked the mains water valve, it's fine - then after a few moments it beeps a few times and the red light (that's on during a cycle) goes out. I've tried different programmes, power cycled it, cleaned the filter, tried the reset function - but no good. I've seen the service video - so plan to do that - but this machine looks like it is encased in a moulded body - so wanted to see if there is anything else (diagnostics perhaps?) I can check before trying to strip it down?