I recently installed sod at a customers front and back yard and it turned out well. 2 weeks later my customer says that in the backyard that 2-3 strips of sod are turning brown. I told her I would check into it and try to put something on it to fix it. Later I thought that in this case I would simply change out the sod for fresh sod, especially since I added a charge to check and fix the problem. On the other hand, if sod goes bad who takes the blame for it? In the 2 weeks anything can go wrong, neglect, high traffic, dog urine, etc. or is it on me the installer to fix it anyways?