Came out for kitchen draining leaking into crawlspace. We had rerouted drain down through cabinet some time ago, this was not the issue. PVC was tied in to an old cast iron line that had rotted through into the crawlspace. Terracotta section outside that was riddled with roots. Replaced line inside crawlspace and drilled new penetration through foundation wall. Trenched from house down to sewer line and routed line down to the sewer with cleanout access in the exterior of the home. Tested to ensure a leak free installation before back filling.