I'm replacing the seals on my La Pavoni Europiccula, and I found these instructions on how to do it from How to Operate, Maintain, and Repair Your la Pavoni Espresso Machine. Good stuff, very helpful. 
Together with La Pavoni's part overview (the first page), it was a real help. Only thing I couldn't do was replace the mini rubber gasket because I don't have ring pliers.
