OK, so good news. I was able to get the shower faucet out through the shower and found my leak! It started about 1/2" behind the faucet connection and split the hose about 4" down. We don't normally get really cold winters here in Chattanooga but this year we got that cold snap and I guess I didn't drain it well enough. So, tomorrow morning I will go in search of an adapter to take me from the old 3/8" gray tubing to PEX and replace probably both lines since they are both exposed to that outer wall right next to the shower. I am considering re-plumbing the whole thing in PEX but I have to do some research before I take that on. Not gonna lie, I probably won't since, for the most part, this thing will not see much cold weather use. I'll just have to winterize better next time.
Thank you for everyones help and I'll post when I get her running again!
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