Came out for leaking kitchen drain. Arrived and found wet spot on drywall ceiling in the basement. Cut open the drywall and found a section of the cast iron has rotted out on the bottom side. Received approval to reroute the kitchen drain. Disconnected the cast iron in the basement and under the sink. Capped off the cast iron under the sink, in the basement, and the vent stack on the roof. Drilled down through cabinet. Cut out section of cast iron mainline and added new pvc branch line. Connected plumbing under sink down into new branch line in the basement. Installed AAV under kitchen sink. Tested to ensure proper function and a leak free installation. No further issue at this time.
