Can anyone recommend good companies to root cause  and implement solution to fix this issue?

I rarely see anyone address the underlying root cause of the issue.

I guess I can't wrap my head around the fact that anyone can make an argument as to how the doors and windows being left open was not the root cause of this issue.

Some old Milwaukee sewer laterals have tree roots that like catch on to stuff.We also eliminate garbage disposals during rehab and normally we have someone from our team check out issues, before we send a plumber.

In fact, the residents are deeply rooted - "mobile home residents are less likely to move than residents of site built houses.  

If you have an active root...over time it will grow back in there unless you excavate, cut and remove. 

It's of vital importance that you speak with your GP to determine the root cause of the capital call so that you can make an informed decision on whether or not you should provide it. 

What is not helpful is the assumption that some responders made that the root cause is the PM's communication style was not to my "liking".

As to the quandary posed by the OP: The root of the issue is that it basically sucks to be an RE investor these days.

If we tried to plant the whole tree there would not be enough roots to support the leaves.