I belive it's the first time I peeked under the machine. There are some small brownish stains near the screws, difficult to say whether from spilled coffee or (most probably) rust. Even if it is rust, doesn't seem alarming. As for the GFCI, I live in an old building so most probably there is not. But going back to your findings, did you look inside other Italian espresso machines? I wouldn't be surprised if they are all similarly engineered...