Good job, Patricio!
Wish I knew a way to test the main CCU and the pressure switch to tell which is bad. As it is, we're pretty much stuck with edumucated guesswork and experiential observations of what works. And trial and error. Sucks that even the manufacturer can't give us clear, specific procedures to test these things. I've even read about cases of this problem being caused by the steam control board. It's crazy!
Got one of these washers coming up this Saturday. Going armed with both the pressure switch and the main CCU. I'll make a video if it turns out to be something interesting.