[Solved] AEG F78002VIOP Dishwasher Error i20: Drain Pump Issues, Black Residue & Possible Solutions

Hi
I have an AEG F78002VIOP / 911434029/06 dishwasher which has been freezing several times in one program for some time. After reading a few posts, to check if nothing fell into the drain pump, I started the dishwasher. Pump clean without any blockage. I am wondering about such a black raid marked in the picture, is it normal or maybe it means that the pump is ending its life? Should the pump have such play when turning this gibberish, there is only resistance in one place? Any ideas on how to fix the fault?


best regards

Sensor cleaned and gasket dissolved. The gasket replaced the dishwasher has started.