have you tried flusing out with well known de-scaler shown on tv.
residual gease collects over time in the pipes underneath the appliance, where all of the circulation pipes are, if your pots have been coming out not as clean as you would like, blast a couple of sachets of de-scaler through.
READ packet instructions first..do with machine empty
this might sovle your prolem as it sounds like a pressure/circulation fault
graham, January 2007