The dealer "replaced/fixed" it under warranty. It leaked again within a month of them working on it...So, I fixed it myself for the price of a tube of RTV/silicone.
Remove the A pillar trim, grab handle, sun visor, and center upper console. Then you can pull the headliner down enough to get your hands above it. Unplug the 2 plugs, and remove the bolt that holds the ant bracket. I think its 10mm, but it might be 8mm, I don't remember. The bracket only goes on one way, so pay attention. Pull the ant out, clean the sheet metal. I took my ant apart and cleaned and dried it. I silicone the crap out of it, then reinstalled. Hasn't leaked since. I did the 3rd brake light as well, because it'll leak too. The "gasket" on both is foam. Foam gaskets WILL eventually leak. Good luck...