Could be leaking at the drain to shower pan connection or in the line from diverter to shower head(in the wall).
I had a leak in a new coach in the shower diverter wall because the factory did not put a crimp ring on one of the pipes. Took 6 months to show up.
You can isolate the two areas by not turning on the shower and placing a garden hose in the shower to run water through the drain, see if the leak appears. And/or torn on the shower head and run the water into a bucket and see if the leak appears. The drain should be accessible somehow. On my Ace it was through an access in the wheel well compartment that was not cut out at the factory. I had to cut it out, fix the drain and fabricate a cover for the access. To access the diverter I had to pull the panel loose in the hallway.
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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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