Tech arrived and was greeted by a customer who had shown him to the master bedroom bathroom, to which the shower had been continuously running. Tech observed and confirmed that it was a Moen single handle shower valve body. Water was turned off and valve body was disassembled to confirm that it had been a Moen Posi temp cartridge. Customer was informed on the price and signed off acknowledging for work to be complete. A new posit temp cartridge was installed and water to the unit was turned back on in order to test and insure that there was no longer a drip and the shower valve was working properly.