So what ultimately happened here was that somehow I got a 9V wire assembly that was wired backwards, so the 9V battery I attached to the board was feeding opposite polarity and blowing the board. I made the mistake of testing this on a second PS1 engine (the AC-6) and it broke that engine's board as well. GGG discovered this and the repair entailed replacing the board and the 9V battery connection wire on both engines.
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