HELP!!! Major sewer leak under slab unexpected!

[Jamie Wooley]

I have a rehab property here in Garland and I finished the foundation only to get the call from the company telling me I had a leak.  Of course I got a second opinion my neighbor who owns a plumbing company to go out and he also verified yes, sewer leak.  They ran the camera and there are multiple leaks throughout the home.  The house is cast iron plumbing large tree roots have grown into some of the plumbing we believe because the camera hit dirt and would not push through.  I did not account for this at all.  Please tell me my options here on all levels!!! They quoted $15,000 to redo all the plumbing. Oh my, no way!  1463 sq ft home.  Btw I have not put any flooring down I left that to do last of course, if that matters in the options I have.

So, does anyone know another company, another solution.  Can I sell the house without the warranty for the foundation and still get a conventional buyer???  The house plumbing works wonderfully.  I am totally at a loss here on my next move and could really use some advice.  I thought I knew all the BIG TICKET ITEMS, apparently I overlooked a major one!!! Wow do I feel like a fool!  Any advice would be appreciated.  Thanks so much!  I need to figure something out like yesterday!