I imagine Ira will chime in on how to open that part up and see what's
gotten in there, but I would stop using the machine in the meantime. At
least be very careful and crack the PF open slowly to let off pressure
slowly.
Wow, I'm getting a reputation I see.
There are good exploded drawings of the group head on HB, http://www.home-barista.com/espresso-machines/e61-group-espresso-machine-detailed-interior-schematics-t397.html , which should let you see how it works.
I'd guess its the screen or dispersion block clogged with coffee or scale and not the inside of the group.
I'd start by removing the gasket, screen and dispersion block to see if the little holes there are clogging up. I think I used a giant flat washer in a vice-grips to unscrew the dispersion block. When you put it back, remember you want to be able to take it off again in the future, so just nice and snug, not tight.
Then, I'd pop off the big nut on top and and have a look at the mushroom to see if it needs descaling and then the bottom nut to see if it looks clean. Wrap the nut with tape so you don't scratch. I have a 36mm 3/4 drive socket and 24" breaker bar from my dad's Porsche days and the the nut came off like it was only finger tight. But remember, it's brass, so it's soft and easy to mar so I'd recommend a socket or box end wrench. You might also consider marking it so you know where to stop when putting it back on, it's really big but shouldn't be that tight.
Ira
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