If it is behind the shower like mine(you can tell by opening the sliding door, pushing it slightly forward, and looking in the slot with a flashlight), you will not reach it by removing the shower faucet. Been there, tried that.
This weekend I cut an 8 x 8" hole in the back of the kitchen cupboard and got easy access. The valve was broken - the plastic actually had snapped where it meets the plastic tubing. It looks like Keystone cut the down stream water line too short and the resulting downward pull on the valve fatigued the plastic over time. I will remedy that when I get a new valve to install.
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