If the above doesn't work. It might also be a lot of water splashed out of the tub. I had an possibly uninformed tenant overflow the tub, ruined $5,000 worth of carpet, collapsed the ceiling and walls downstairs. Major, major damage. And of course no recovery of costs. You might get a wall camera - remove the shower faucet handles - down to the mixer stems. This should allow room to get a wall camera inside. Turn on the water and see if anything is leaking inside the wall. Otherwise you may need to cut a hole in the ceiling to look. The "ideal" solution. Ceramic tile the bath. Green board with a waterproof membrane around the tub/shower. Use "ditra-mat" with doule mortar under the tile, and then cault around the edges. That will solve any spray problems.
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