Of course for other items that are not covered I use local resources to fix the problems.The fact that your property is 15 years and counting, if I were you the warranty would be one of my tools used to manage repairs that will surface later.Lastly, I look at the use of warranty as an insurance policy.

Quote from @Chris Seveney: @Bernie BurkeIf you invest in a syndication make sure to get updated reviews - whether here on BP, or in other investment clubs, a lot of the buried bodies are making their way to the surface.  

Sounds good on the surface and collapses upon actual calculation/analysis.

It can also come to surface that you don't really have a partner............where does that lead you?

There is no such thing as a quiet real estate transaction, eventually what people do will surface.

As to the water on the subfloor, it looks like it’s coming in from surface water since the stain is so high.  

Then, test and identify drainage by filling tanks with a water hose to see where/how they drain.That's my three cents.

I've looked into a few things that can be done while continuing in the day job, and the idea of investing in real estate keeps bubbling to the surface. 

I'm just scratching the surface.

Don't buy a smooth plank, they scratch too easily; get a one with texture/graining. try the old Rub it with a quarter to see if the surface scratches.