Since there were already issues with starting a game prior to replacing the main board, I was thinking this is possibly due to relay switch issues (Q / T / U) under the main playfield. I had very similar issues and cleaned mine with some cut up business card strips, and made sure that everything was contacting correctly. This was on a nicely rebuilt machine that already had been adjusted, but those old machines have gremlins pop up.

Here is an old thread that might help:
https://pinside.com/pinball/forum/topic/haunted-house-issue#post-6249485-parent