Found that the home has lots of water damage which is caused by the kitchen drain pulled apart due to incorrect installation. Replaced 1-1/2 tubular drainage. Tested and inspected. No other leaks. Also found a 4” cast iron vent pipe in basement ceiling that goes through the roof that has a large crack and leaks when it rains. Need to cut hole in basement ceiling and upstairs hall bathroom wall for access, cut out about 3-5ft section of cast iron and replace with pvc.