Andrew,
I’m so sorry…I don’t know how i missed that you posted those photos. That gives me a good visual of your board. I’m curious if the board behaves in the same weird way when it’s out of the chassis, and the pots are pulled up a bit (away from the board) as in the photos. I want to see if something might be making a short to the board, like the pots or the chassis. It seems like some of the leads under the pots are long enough to potentially poke through the paper. Let me know about that.
It’s not easy to test the crystal with out an oscilloscope, but if the green led is blinking consistently then it should be working alright.
-Brach