I had a goofball one last night. I accidentally found the issue with a donkey kong board on my bench. I was poking around the moving objects circuit because I had a "dead zone" where moving objects would disappear.

So while poking around I set my hand on the board near the 74LS161 at 5L. I just so happened to touch the via of the output of 5P which unknown to me at the time was floating. My hand had effected the signal just enough to register as a "valid" signal. After replacing the 74LS30 at 5P, it fixed my issue. Looking at it on my chip tester, it confirmed my findings.

For giggles I also did a youtube video showing this. It's really funny to me how these things work out sometimes.