Aloha from Hawaii. My wife and I just purchased a house and found a leak in the drainage system. here's the catch...the pipe runs down from our second level house(on long post and pier)to ground level then follows the ground under a portion of cement. The cement is crack along the line of the pipe and whenever we put anything down the drains, water bubbles up from the crack in the cement. The pipe only runs under the length of about 2.5 feet of concrete. Do I have to pull up the concrete and replace the portion of the pipe or is there anyway to patch it thru the crack or from the inside of the pipe like a radiator stop leak type of thing for a car.