I got my Pro in, didn't run diagnostics but checked all the wiring, then proceeded to install some playfield mods, played about 10-15 games on the installed code, and then updated it.
I'm having no issues so far whatsoever. Well, actually one nuance I noticed but it was before the code update, was a loud weird pop sound when I got a "match" at the end of a game. Not sure if that's just normal though or something to worry about quite yet.
I'm surprised I haven't even experienced repetitive sdtm Gene balls or the black rubber markings many have complained about thus far. (I've only put in about 50 games worth, for what it's worth)
If all keeps going well I'm very happy with my first pinball purchase. I was afraid if I spent more on the Prem or LE the issues you're having or worse would definitely have plagued me, with my luck. You're posts definitely had me a little nervous about my Pro and I was expecting anything to happen.
I'm sorry to hear your still experiencing troubles with yours, Minneapolispin. I hope all gets resolved fast for ya. One Kiss tard to another.