There are two drain hoses in the front, both running down the A-pillar, and two in the rear, running down the C-pillar. If these hoses get clogged with leaves, dirt, etc. the water stays in the drainage tray.
Dealer will probably run a wire down and see if they are plugged, if the are not plugged, it is possible that during assembly the hoses got kinked in the factory during build.
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Black Sheep Hummer Squadron
(ME TOO)
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