Arrived at the customer’s property to a backed up kitchen line in unit 109 and a complaint of slow drains in the unit above. We ran fixtures in both units and determined the clog was isolated to the kitchen line. Behind the kitchen sink in unit 109 the carpet was wet and the base board was also damp. We began drain cleaning through the under sink waste piping and were able to clear the line at about 6 feet out. We then tested the drain which was now draining properly. We then opened up an 8x8 inch section of drywall to gain access to the waste piping behind the wall where the wet carpet was present. We exposed the drain piping and found a cracked abs sanitary tee. We ran water from unit 109 and from the unit above and did not see water leaking but after cleaning off the tee we noticed the crack. With the drains clogged and the pipes full of water the crack in the tee caused water to come out and leak in the wall and eventually onto the carpet. The tee is 2x 1 1/2” x 1 1/2 and needs re