The Management Company is recommending at this point, because there is a dispute, to send some kind of bill showing that this work was done and if not, it would be best to issue a refund.

There is some repeated confusion around this topic because pretty much all of the main servicing companies that service DSCR Loans are prone to mistakes - and sometimes accidentally report it. 

Build a team of people to help; an agent who isn't trying to talk you into every opportunity and knows how to analyze a deal; a lender who offers you all the possibilities; an inspection company that can get things done quickly; finally a property management company that comes with good referrals.

You would want to work closely with your CPA or a good 1031 company to nail down the timing of it all. 

If not, I would still recommend going ahead with a professional cleaning company that has experience with mold remediation (make sure they send before and after pictures as well), if you really wanted you could give a small credit to the tenant to make them happy as well but 100% not required. 

I have been investing in SFRs for the last 16 years and I have built a turnkey company from the ground up starting in 2013. 

I think I would look for a company that has an architect and construction so that just maybe things are a little more streamlined.

Doesn't work that way.When you start getting into larger buildings that have been run by property management companies historical data becomes more important and a bigger predictor of future performance.

Are there any specific marketing channels or tactics that property management companies often overlook but can be highly effective in lead generation?

@Brianna Johnson you’ll need to find out from your mortgage company how much extra you can pay into an escrow account because many have overage triggers where they’ll send it back to you if it goes over their limits.