Run snake through kitchen drain line and clear stoppage. Afterwards run camera and inspect line. Remove section of old cast iron piping and replace with pvc. Reroute kitchen drain to different drain and cap off old drain. Customer stated that kitchen sink was backing up. Gave customer quote to run snake and customer agreed. Went ahead and ran snake and afterwards ran camera from clean out. Found out there was a lot of sludge buildup in pipe and recommended customer replacing section of cast-iron with PVC and customer agreed. Went ahead and cut out section of cast-iron and capped off drain. Rerouted drain to tie into another drain line. Afterwards filled up sink multiple times to test and now kitchen is draining as it should and no leaks were present at this time. Cleaned up work area.