The first thing that has to be done is DIAGNOSE the problem. Is the pipie separated, broken? Find out by video inspecting the line, for a few hundred dollars a licensed plumbing contractor can give you a price to repair, replace with a video of your main line sewer to the street to view with family and friends forever. By the way they make great gifts.
Bill( used to be in Chicago)
The Local Plumber
Tustin, California http://www.TheLocalPlumber.com