Tech arrived and was met by customer who explained to him that he had thought that there was a leak from his cartridge and shower hose. Tech tighten down cartridge that homeowner had installed sealing the leak. While on site customer explained that he had asked previous contractor to install to isolation valves for the shower. Tech gave customer pricing and options, was authorized To install two new half-inch ball valves. Once work was completed customer turn water back on to the house, no leaks or malfunctions are present at this time.