Homeowner had attempted to remove the shower cartridge in the master bathroom. During this the cartridge broke off and was stuck inside the valve. I was able to remove it after several attempts and trying different methods. Installed new cartridge and tested. Homeowner had broken screw that holds the handle to the cartridge. I tested and verified all was working properly. The thermal expansion tank is ruptured internally and is no longer protecting the plumbing system. The water heater is 12 years old and I am recommending replacement.