About 1/3 of the deals fall through at their end because people "have stuff happen" in their lives like Job Loss, Lose Momentum getting credit cleaned up, Medical Issues, Divorce, "Changed their mind", Don't REALLY want to be home owners, etc.

What other issues should I take into account?

You start making the mortgage payments technically but the renter will actually be paying you and the you pay the mort.

They have kept up with both tenant requests and general maintenance issues (I’m out of state).

I've seen it over and over again, a couple could have worked out the issues, (Yes in most cases they can) but they won't just step back and take a deep breath and think about what they are doing, They married for a reason and that reason still exists.

I believe technically the town may own the portion of where the sewer line goes through but I maintain that area. 

I started my marketing for wholesaling three months ago but then almost immediately ran into severe financial issues that I'm still trying to dig out of (I'm aware of the strategies like those mentioned in @Brandon Turner's recent video of what to do when financially struggling https://www.youtube.com/watch?

I work in a technical field (engineering) and enjoy it.

We drove by the place yesterday, looks like central air might be an issue.

My wife and I are relocating, have found a lovely home for ourselves, just received the home inspection...Aside from some minor to moderate issues...Polybutylene piping is in the home...House is approx 2,200 sq. feet...Assuming we can come to a meeting of the mind with other issues, what do you feel cost to remediate this plumbing?