Lisa,
Do you know anyone that might have a video inspection camera? It is a handheld device that has a flexible probe with a small camera and light mounted on the end. Most plumbers should have one. Don't know if a rental place would carry them. They are made for getting into tight spaces. This would be the best bet in finding your leak. Worst case senario would be to pull out the shower/tub assembly. The water line for your hot water tank also runs under the shower along the outside wall. Good luck.
Bob
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2014 FR Heritage Glen 282RK
2013 F250 HD 6.7L Diesel
Formerly Owned: 1995 22D Fun Chaser & 2901L Classic
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