Noticed the drains in the 2 bathrooms starting to get clogged and the toilet had some bubbling so I called a plumber to come out. I was at work, so I am not sure what all he did but the wife said he took off the toilet and hooked up a "vacuum" and the plumber said he was getting mud. He told her we have a busted sewer line and it needed to be replaced. The quote ($8800) is for the replacement of the entire line (65'). Does this sound right? I asked her if he used a camera and she didn't think her did. Would they need to replace the entire line or could fix the broken area? House is 80 years old, so I am guessing it is cast iron. Any advice would be appreciated.