Met with Mr. Brown, and he stated that he had a shower cartridge in his guest home that was scolding, and would not provide any cold water. I went ahead and turned the water off, removed the cartridge , and noticed the cartridge was inserted incorrectly. I also noticed that the handle was on the wrong side, which was also causing temperature issues . I went ahead and took apart the cartridge cleaned out any debris and inserted the cartridge in its proper position. Hot on the left hand cold on the right. I also adjusted the scold guard to allow an adequate amount of hot water. I then repositioned the handle to allow proper cold and hot water flow. I tested the shower to make sure there were no further issues.