There are two parts you have to look for: (1) the brewing unit, use this [guide|136633|guide]. After five years the seals are not in good condition, I suppose. (2) The grinder. The coffee ground must be rather fine. If the grindstones are dull, the beans will be bruised and not cut, resulting thin coffee. In this case the grinder must be replaced, for ENA Models the grindstones are not available alone. Not cheap...