It comes down to this.

Mr. Peepers is taking a break from the European travelog to tend to a plugged sewer line. Yes even with this it's great to be back in the USA, in particular Wyoming. The trouble spot is beneath the driveway where there is some subsidence. In order to inject acid at this point, I must drain all the lines upstream of the cleanout by loosening the cap and allowing the backed up water to trickle out. I learned from past bad experience you cannot take the cap off to drain ten feet of head.