2007 Interstate with roof leak UNDER A/C unit

mything2

2007 Airstream Interstate
This leak shows itself in hard rain and/or running the a/c. It streams down the left corner (looking from the front).
Where do I begin to get at it assuming it’s a gasket that’s failed. How is the a/c attached- hope not from the interior:( since it’s polished aluminum ceiling.

Any input appreciated!

Semper Fi

Dan F
 

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