Snake the main sewer line next to the washer and the last sink on the basement first used the k 50 snake machine 80 ft and run water to see any back up and line still holding water then I used the k60 snake machine and 150 ft and we open the main sewer city out side on the street and put the camera to inspect the sewer and the bottom of the pipe is broken also located the sewer line in the front of the house