If I can't get the threads out, is it fairly easy to replace the entire tub/shower valve ? The two handled valve looks like it attaches to a box with four screw on the shower surround. If you remove the four screws, can the entire faucet be removed ? Or do you have to access from the back side of the valve ? There is not an access panel in the wall directly behind the valve, but there is a panel beside the tub right above the floor. I'm not sure if you could reach in and access the back side of the faucet from that panel.
Does anyone know if removing the four square head screws would allow the faucet to be removed and replaced ?