Upon arrival to the location, I turned off the water to the home and got key to opened door. Brian was having issues with his hot water, it was lukewarm, and not getting hot enough as it was. I went to the bathroom and cut into both lines to the diverter valve, to install check valves to stop water from mixing into the lines. I checked the hot water at the kitchen, other bathrooms and it was much hotter than it was prior. No leaks detected, all is operating accordingly at the moment.