I had the same problem, I have a light bar on my truck, the harness of the light bar are routed by the driver's side roof marker and it was leaking there into the cabin, they (dealer) replaced the rubber booth under the roof marker and the leak stopped 
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"2003 Sage green LUX, wrapped around brush guard with off road lamps, roof mounted SMA light bar, AirAid Jr. kit, Delphi Touchscreen Navigation Radio with a 6 CD changer and more! Also a member of the HOPE (Hummer Owners Prepared for Emergencies) pro
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