Returned to do a manufacturer's warranty water heater swap, but Rheem denied the claim. Claim number is CAS-1558457-D9D7L2. customer agreed to do the repair of the water heater which included the temperature and pressure valve replacement, thermal expansion tank install, rework of the plumbing up above the water heater. As well, the p r v swap out. After draining the house down, i cut out all of the bad piping up above the water.Heater and removed the temperature and pressure valve and reworked all of the plumbing up above it.And installed a thermal expansion tank.That's bracketed, as well as a temperature.And pressure valve that has a low point drain. I then installed a p r v. Slowly turn the water back on to prime all of the air out of the water lines.And found a very slow leak coming off of the body of the p.R v. This was at no fitting or screw on the p.R v. The body actually has a micro crack that was leaking. I drained the house back down again and replaced the p.R v. Reprimed the