Depending on whether you have warranty or not - you can do the repair yourself or you can have Krups fix it for you. I just fixed the problem on our machine, it was giving error code 06. I used the information given by "paul on trav" on this page: http://www.fixya.com/support/t5422782-xp7240_recently_only_half
Very useful information, in particular on how to access the 4 hidden screws and open up the machine.
Seems to work fine again. It was the valve in our case as well, but due to coffee rest clogging/blocking it.
Joris, August 2010