Any advice here would be appreciated. Fixed a customers WM and was asked to look at the DW; a Bernstein 01-800270 (Servis I think). It intermittently overfills, flooding the floor. There is a pressure chamber under the filters with a 4 screw lid and an o-ring seal. This is all clean. I didn’t have time to pull it out, is there and common problem with this machine (p-switch, o-ring not sealing) or are they usually just blocked further up the pipe?