My money is on a cracked tank, leaking Grey water under the unit on top of the black bottom cover. I bet you have a cracked galley tank spud.
If you would hook up and drive off I bet you would leave a trail of water. Can you see any water dripping or on the ground at all?
I know you stated you did not see any, but it is worth a second look.
You might have to drop the cover in that area to look at it.
Happened to me, had to patch the tank at the spud, not a bad job at all.
Ozz
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