I'm replacing a cracked, root infested section of my main sewer line. Total length to be replaced is about 50'. The pipe leads another 100' to the septic system. Original pipe is 4" clay. Part to be replaced is 10' inside slab on grade foundation making a trench the entire length a mind bender. Can you give me the pro's and con's of the different alternatives. I am in east TX and my options are limited. Trench entire length/ pull a pipe though/ epoxy coat the existing pipe. The pipe has been viewed via camera and there are 2 connections at far end and one close to the other end. Thanks.