I had the same problem and it is a very simple fix. There are drainage tubes that run along the roof line and somewhere down and out. They get kinked (most likely at installation), which causes them to back up and leak. The dealers have a fix for this so just take it in. This means that GM is aware of it and has the remedy. I heard a fauced type sound in mine when it was raining her in SoCal. It eventually backed up and started to drip on my dash. Don't sweat it!
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