I was talking about this one :
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It shows you the possible spawn locations of the buttons.
Edit : It's missing one possible location though, which is the control room between the two rooms with beds.
Edit 2 : My bad, it's actually missing two possible locations, the one in the first edit and the last one is one of the two rooms with a lot of chairs. I don't have any screenshots on hand so hopefully you'll know what I'm referring to.
Sadly, the only way to shorten the process would be YOU knowing all the possible locations but you'll still have to check all of those locations everytime. So yeah, you're gonna have to do a bit of grind.