Pride Plumbing came out and provided cost estimates to 1) trench a ditch from the house to the septic tank to expose and remove the outside main sewer septic drain line; install a new 4-inch PVC sewer drain line (connecting it to the main drain line under the home) along with proper cleanouts and fittings per code; install tracer wire in the ditch along with the new sewer drain line; and seal the septic tank penetration and backfill, tamp, and spread grass seed and straw after the work has been completed; or 2) dig down in the yard to expose a defective section of the outside main sewer septic drain line; replace that section of sewer line with new 4-inch PVC piping and fittings along with installing a new PVC outside clean out - connecting back onto the existing cast iron piping with new Fernco couplings; test the new piping for leaks and working order; and backfill, tamp, and spread grass seed and straw after the work has been completed.