This is probably not your problem but something to check.....
When I had my Outlaw 29H, the Low Point Drains were under the shower pan. I had to remove the access panel under the shower pan to open them.... which was a real challenge unless your hand could bend in unnatural ways.
If yours are located under the shower pan as well, one of them could have a slow leak. Not likely since you only see it after taking a shower but worth looking into if your Low Point Drains under the shower pan and they would exit the coach in that spot.
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