My much loved expresso machine has the same fault,the leak is from the small pipe, at each end you will see a retaining clip,remove the clip and withdraw the pipe,the pipe has a small O ring seal at each end they need replacing ( I hav'nt located any new ones yet ) dont waste your time trying to seal it, I tried with some furnox lasted for 2 large cups the leaked all over the worktop!!!!The screws in the bottom are tamper proof torx, but I have found with right size flat blade screw driver you can undo the screw,
sparky buckingham, November 2008