I bought a 2016 Impala Lt 2 weeks ago. 3 days later I noticed water in the spare tire compartment. So I googled it & found this site. I called the dealer asked them about this. They said there was a bulletin from GM on the 2014 only. But they would look at the car & see if they could find anything. Just got it back Friday & they said they ran water over car for 45 minutes & could not duplicate the problem. It rained again this weekend. Lo & behold, I have water in the trunk again. Now they want me to take it to a body shop & see if they can find the problem. Any suggestions on how I should handle this. Thanks.