Pride Plumbing came out and provided cost estimates to either rebuild a leaking single handle bathtub/shower valve by replacing its cartridge or replace it with a new Delta R10000-UNBX rough-in valve (this would include cutting an access in the shower wall; adding a Delta chrome trim kit (replacing the shower head, valve cover and handle, overflow cover, and downspout push button diverter); converting the valve's above-floor hot and cold water supply lines to PEX piping and fittings - tying them into the home's existing main water lines; and installing a plastic plumbing access panel over the hole we cut in the wall).