The root cause of all of these is those cap rate spread.

If for example there were signs of root infiltration through a joint or something, I would consider taking an action, BUT that might not mean replacing the line. 

I do like the idea of house-hacking, but I'm pretty rooted in LA at the moment.

Offsets, root/soil intrusion and some build-up in the pipe.

.: Olympia WA just passed an assistance program for certain minorities if they can show they have roots in this state prior to 1968.

Specifically regarding plumbing you could add (depending on your State or Local Laws) "... unless determined by repair person that such blockage occurred during the time Tenant controlled the Premises and due to some fault or negligence of Tenant, specifically excluding blockages caused by roots or backups from the street..."

I'm rooting for you to get to number 10!!!

If it is roots, joint corrosion, etc we get it chained which has some risk but clears the drain of anything except pipe breakage that would cause a clog.Good luck

I guess I have to find root cause first.

Rooting for you, thank you for your service, and let us know how we can help!