Check for clogged drain
These units drains plug up and will then drip inside. Go on the roof and look closely at the A/C cover (shroud). About 2/3rd of the way back (from the front of the cover, where front is the edge closest to the front bumper of coach) look down for a tiny drain hole, or nipple. Likely will be black, so hard to spot. Take a pipe cleaner (or any small wire) and stick it through that nipple several inches. Do the same on the opposite side. Hopefully leak gone. Just had to do it on my coach. These leaks are usually clogged drains, loose bolts holding unit down so the seal is not tight, or a bad seal (gasket) between the roof and the A/C unit.
Good luck
Note: While you are on the roof, clear out the drains of your other A/C as well.
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