Have someone simulate a rain shower with a water hose while sitting in the Jeep. Might want to lift the carpet to speed drying otherwise mold/mildew can become the next issue.
I have that on my 18 jku, just haven’t gotten around to finding the source. Probably where I ran some wires through the firewall is what I’m thinking. But could be wrong. Once this heat dies down here in south Florida I’ll get to it.