As an aside, I asked him what he thought of the low flow toilets that are now mandatory. He said he get some added business from them. In many cases, the toilet works very well and clears everything. The problem is down the line if there is not enough water to float everything down.
He tells customers to give an extra flush, especially if you use a lot of paper. He also said the best paper to use is the Scott with 1,000 sheets per roll. It breaks down better an gets carried away easier than other brands.Of course, feminine products should not be flushed.
Meantime, I have to decide what to do with my line. It works OK , but the roots will come back. He estimates about $2500 to dig in the dirt, tunnel about a foot to do the repair.