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We are in the process of finishing our basement. One of the job is to apply a new layer of cement on the floor which will require the contractors to remove the old layer. One of my friends recommended me that if we were going to do that, we should consider replacing our sewer line since it will be exposed. I am not too knowledgeable when it comes to the house (lived in Manhattan all my life). The house is about +80 yrs old.. What is your take on this? What are the chances of the sewer line going bad? Thanks