Customer called in because of shower valve dripping continuously from shower head. Shut water off to system. Drained system. Removed existing trim. Removed existing shower cartridge. Installed new cartridge. Returned water to system. Checked for leaks. No leaks found at this time. Reinstalled trim. Tested installation. Shower working as designed. Note:This repair was done under warranty. Also let customer know that shower wands do hold small amounts of water and can take a few hours to completely drain out.