I have everything working on my Jurassic Park now, minus the shaker motor. I reflowed solder on the shaker motor board, replaced the TIP on the CPU board that controls power to it, and I have continuity to the shaker board from the backbox, but it does not work. I was going to just connect a battery to it to see if I could get it to turn, but I figured I'd ask here first about what to look for specifically with debugging a non-functioning shaker. Fuses and fuse clips on that board are intact. I also reflowed solder on all pins on the CPU and the relays.