WOW, thanks all the inputs. Lots of searching, reading and talking to experienced friends and trying to understand this whole new chapter is certainly not that as easy as it sound. Still puzzled, but getting a little bid clear now.
@Shawn Thom Congratulation on your 500th post! Keep working hard on BP. We sure need your great advises.
@Kevin Martin, @James Bowie far as I know, only the foundation has been repaired. The damages on dry wall and ceilings are as is. Paper said this warranty is lifetime transferable. Not sure if ceiling cracks are before or after the foundation repair. I don't see brown spot on ceiling, so I know there is no leaking on the roof. Might have to visit the house one more time after Thankgiving as 3+ inch of rain coming this week. This is a bank own house. I can only find the answers and leads through some threads of hints here and there. Main component soil here is clay. In fact, most of DFW soil is clay too.
And you are right, it is slab on grade, but no, it is not a raised foundation. Looks like house settling on the slab but not sure. I will hire engineer to get the sewer and plumbing test for the leak only after if they accepts my offer. Also call office to ask for engineer reports if they still open tomorrow.
Property is located in a clean, nice and young community, less than 10 years. Still have new houses building around it. I plan to fix and hold if the number works out. If not, lesson learned and walk away.