Determined kitchen/laundry shared line stoppage. Abs drain. Tubular trap under basin sink in garage was leaking. As a courtesy, reattached drain to stop leak. Clean out for shared drain outside kitchen wall exterior. Accessed and ran snake approx 31ft to blockage. Ran water to test and verified at mainline clean out water was passing through. Mainline clean out, 3” abs, did not have a cap in place. Tested and temporarily restored flow at this time. Line had a lot of sludge debris and lint.