The best way is to remove the lid + back half casing and do a rinse and spin whilst looking for any drips. getting the back off is a major operation on the Zanussis and you will need an 8mm 1/4" drive socket for the screws concealed with plastic plugs at the bottom of each side. You also need to prise off the inlet connector holder that clips onto the top edge of the casing. You may find that the plastic drum has been punctured. I usually repair small holes by welding with a soldering iron followed by a coating of RTV silicone.
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