Today we showed up for a complimentary Plumbing evaluation set from another trade upon arrival the homeowner informed us that the toilet wasn't flushing as it should we inspected it and yes it's draining slowly and if you run water down the sink you get bubbles out the toilet so we started looking at the vent we climbed on the roof ran the camera down as far as we could hit stop it where the PVC pipe meets the cast iron you can tell previous repairs have been made throughout the home however the true solution to her problems is to replace all of the cast iron underneath her home however this is not something that she can afford she did mention that she has a Home Warranty company and was just looking to get us to point out the problem we left her some estimates with some options so that we could dig deeper and get a clear understanding as to this one in particular problem but again the overall solution is to gut all of the old dilapidated cast iron and replace it with schedule 40 PVC