I think the problem is happening on the brand new Rottendog CPU board. It sounds like it's pointing more towards either bad CPU and/or bad EPROM.

I've sent more voltage than expected on logic lines on a board in the past and fried a CPU and EPROMs. If this game was configured for low line voltage and subjected to normal line voltage is it possible that > 5V was sent down logic lines? Or would the LM323K regulate it down to 5V?

If you bought a brand new Rottendog with U9 (ASIC) then a new U4 (CPU) and U6 (game EPROM) it should work. If it doesn't then I'd contact the merchant or Rottendog. If you bought it without U9 and have a new U4 and U6 then you have to suspect U9. These can be damaged when removed from the socket.

I know it sounds stupid to mention this but make sure you have oriented the IC in the correct direction. The notch should match up or the dot should match pin 1. I was once in such a hurry to test a repair I made I put U4 in incorrectly and thought I screwed up the repair. After double checking traces and continuity it was then I noticed the problem.