Arrived at customers home. I spoke with the homeowner about her kitchen sink backing up in both compartments. I provided the homeowner with an estimate to do a diagnostic to try to better understand the issue. I also provided her with an estimate to perform drain cleaning on the kitchen line as well as an estimate to replace the under sink tubular waste piping. I explained that a diagnostic would be the best first step in diagnosing the issue. Originally she signed off on the estimate to replace the tubular waste. I explained that this might not resolve the issue. I began by taking apart her current under sink waste piping. As soon as I began disconnecting it I realized that replacing the tubular waste would not resolve the problem of her sink backing up. This appeared to be an issue farther along the secondary line. I explained this to the customer and offered to only charge her for the diagnostic work I had done because I hadn’t begun building the new tubular waste system at that tim