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I noticed that the carpet on the bottom of the rear gate is soaked and I cannot figure out where this is coming from. Found some hairline cracks in the high brake light but curious if this could be an issue? Inspected door seals etc and all looks good and can't find any visual drips inside. See attached pic where water is and of cracks in brake light.
I had a leak in the passenger-side A pillar over the summer, ended up having to pull the headliner down around there to diagnose the issue. Did the usual check on the sunroof drains and it ended up being a very slow leak from the rack mount trim (no drips, just water tension along the frame). Some silicon caulk remedied the issue.
I would recommend grabbing a hose and spraying the roof across the 3rd sunroof first with the top tailgate closed and leaving the bottom down to see if you observe any water running down to rule out a clogged sunroof drain. Then I'd say proceed to the rear of the roof to check if there's something leaking there.