I could use a little help with a Gottlieb Spiderman I recently found. The game has sat untouched since the early 80's in a heated basement and is in super nice shape. The game has no hacks, is super original, and looks like it has never needed or had any service. Of course the power supply board was dead so we put in a brand new Gulf Pinball board. It has a nice ground lug point so it was easy to do the ground mods and run wires to the cabinet floor, the CPU, and the power driver board. I also repined all the connectors on the power supply board and the harness going to the CPU. The game now boots up and plays but after about 30 seconds the CPU seems to lock up. The displays all go blank except for a single digit "0" in the player one position after starting a one player game. The game still plays but there is no scoring or sound. The CPU appears excellent. It's hard to believe the battery has not leaked and shows 3.9V while being rated at 3.6V. There is no corrosion on the CPU at all. The board appears new. I'm guessing it's a CPU problem but I don't have another System 80 game to swap it into for testing. I just thought I'd post this before buying a new CPU. Thanks in advance for any help.