im not 100% sure how this machine works, seems to be a bit more involved than a normal machine, but brew pressure remaining and not purging properly sounds like a jammed 3-way valve (that is if this machine has one).
they're reasonably easy to service but if it's under warranty, don't touch it. take it to a shop and get them to do it. if you work on the machine now and repair the problem but a more serious problem develops in the future which requires a technician, you might run into some problems.
that probably wasnt that helpful but i also came here to say, why would you not want this :P
turbo coffee machine, boosted at 145 psi.