Arrived at the residence and discovered that the hot shower handle had been broken and that the shower valve shouldn’t shut off all the way. I replaced the shower cartridges and both the cold and hot shower handles. When I removed the old shower cartridges I noticed there was a lot of build up in the shower valve. I notified the owner that I could not warranty he shower cartridges due to the condition of the shower cable and that the shower valve would have to be replaced if there was any further issues.