Please let me know what part to replace & how to get to it. The Valve at rear of container is clear & working fine. This slots into the female connector inside at rear of compartment. ( I am assuming that there is a blockage in this part- I don't think it's a pump as water is gravity fed to reservoir at bottom). This has 2 screws. 1 each side of it. Can this be taken out through compartment? Or does the back of machine need to be taken off? If so how is this done? All side & rear panels appear to be welded together? As there don't seem to be retaining screws for the panels. Please advise- with pictures/diagrams, if poss? Thanks.