Unfortunately it's on the outside wall I took the faucet and bezel off and replaced the faucet but it seems the pecs hoses are to long and it didn't start leaking again until tried putting it back into the surround it's kind of a six sided shower that I can't seem to find anywhere
You might try cutting off the pex crimp ring, shorten the piping by an inch or so and installing a new crimp ring, as that was a fix on one of my fittings that started to leak with time and the traveling virabrations on the rig..