Bust up slab in one area in kitchen to repair improper fitting on drain system that is causing frequent blockages to form. Also install Kohler pressure assist toilet in master. TE Certified is not responsible for flooring repairs Installation: Removed marked section of concrete in kitchen. Uncovered 4x3 wye. 4x3 wye had a 3 inch coupling wedged inside partially blocking the branch line. We replaced the wye and attempted to improve the pitch of the branch line. Thoroughly tested and ensured no leaks. Informed customer that we could not fully fix the pitch of the branch line, but the fix did improve flow extremely.