NVR STUCK
The SUNROOF has a front and rear resvoir with a drain in each corner. When either the left side or ight side tube gets clogged or pinched an overflow can occur when the H2 goes off level from side to side.
The amount of water dumped into the dome light - (which happens to be the center low point) can be significant. It is unlikeley it is from one of the front two marker light conduits but it could be. When these areas overflow the water usually drains into the front pull handles and ONSTAR mic area.
Either way it SUX.
Good newa is almost never does the headliner stain and need to be replaced. Get it into the dealer quickly.
Best of luck, Hummer Man
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