Maybe by removing voltage then applying it again, something resets? I have been using my Baby for about 7 years, and the power button on my board has a noticeable indent, but is still working.
I'm not sure if a snap disk could cause this or not. Knock on wood (pellets), the only issue I have had with mine has been the room fan.
I have a spare board for mine, maybe two, I could possibly take a look at one and get a better look at how it works, if you haven't figured it out yet.
Hope this helps. I'm not online too much, but I'll try to check the site.
Tim