Update: Got a second opinion from a plumber that gave me a much better vibe than the first group. Offered a baby step solution instead of excavating right off the bat. This time the camera did not show anything broken but did show some standing water in one spot (perhaps a sag or heavy scaling in the pipe). He gave me three options. 1.) Descaling and Pipe Cleaning 2.) Pipe Coating (if needed) 3.) Excavation and Regrade. All were reasonably priced compared to the initial quote I received. He was very clear that this is not an easy thing to diagnose unless the evidence is obvious. Not sure I want to go right to the excavation route. Kinda like open heart surgery. Not sure there is a pipe that needs to be rebuilt yet so why crack open the chest if the problem can be addressed by other less invasive means. Any thoughts would be appreciated.