Returned and installed a new drain line for the vertical run in the basement. Connected to existing abs pipe and ran the pipe to within a foot of the cast going down into the wood paneling. Reinstated both wye fittings with new PVC wyes to existing cast iron piping. Made customer aware that the way the cast is laid out that there is even sloping for the last 2 of so feet of pvc. Tested all work to ensure proper slop, drain, and no leaks. None were found.