Don't know about KY but TX -- this area of it, anyway -- is notorious for houses developing slab / leveling issues. My parents have had theirs fixed (different areas of it) multiple times. At least one of the sewer pipes in the slab broke, for a bar sink in the middle of the kitchen/family room area and whatever else connects through it. The plumbing company had to tunnel under the house for access to fix it.
Their neighbor recently had some foundation repair (not plumbing) via twelve holes dug through the slab around the perimeter of her family room in middle of the house.