Spin the drum by hand, could be something between drum and housing, do you hear or feel anything.
Do you mean drain pump when you say remove 4 screws?
Best bet is to remove drain pump and drum sump, clean and re-fit. Also checking the connecting pipes are clear from obstruction.
Yes I mean the drain pipe. There is another pipe next to it that is bigger. I don't know what this pipe is. Think the only way to get a proper view is to put the machine on it's back. Sorry can't take photos as camera has decided not to work as well! Geeso no having a good week!
So I am going to remove the 4 screws and see what happens, got to have this sorted very soon