Yeah, I already read about people like you.
The cabinet is in rough shape, both player joysticks no longer center, the monitor has sever burn in, the power cord is severely frayed. All of the keys are missing but everything was left unlocked.
I'll be gutting the whole thing, sanding it down and refinishing it. And honestly it looks like someone already started because it doesn't have the original bezel and one of the sides is missing all of the original cab art.
I could understand if this was a really rare cabinet or something, but Tetris is well known and I am sure there is more then an abundance of the cabinets still in existence.
And if I don't find anyone to buy the PCB, it'll most likely go in the trash. So there's your preservation.