IF this has happened where the drainage pipe runs through the house out to the street then it may be a dig up and repair job or it may be nothing terrible at all but until the tile comes up it's a guess at best as to which way it will go. If you need to dig it up and have to hire a plumber its going to cost a bit and it is a mess. Is this the reason they are selling the home? See what the inspector reveal's.
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