Might have a blockage somewhere.

An overflowing toilet isn't a leak, it's a clog/blockage. 

They can also scope it to see if there is any major blockages I.e.

I have a plumber coming on Tuesday btw.Sounds like you have a main stack blockage.

I just don't want this to become some sort of mind blockage for you, preventing you from pulling the trigger. 

Garage springs broke, Stove hood vent broke, sewer pipe blockage, water softener went out, water heater.As others have suggested you could househack and rent out a room to help cover your mortgage.Having a house is wonderful but don't stretch your limits and put yourself in a bind if something breaks.If saving 10k doesn't seem realistic you may want to start reviewing your expenses and ways you can cut some things out. 

They will be back out either today or tomorrow to pump the right one and hopefully that clears the blockage in my one bathroom. 

Next guy was more experienced and used water jetting to clear the blockage. 

The line may need to be flushed if there is a blockage the scope cannot see past.

His suggestion was to rip out the plaster walls to trace the pipe to either replace the piping or determine the location of the blockage so it can be addressed.This sounds very drastic and expensive to me.