I recently took Max to his first automated car wash. I saw a stream of the high pressure water coming in around the lift gate. So when I took Max in for his 14S04 recall, I had the dealer check it out.
They found that the seal around the lift gate glass was leaking. They removed the glass and re-sealed it. All under warranty.
The service advisor said that this was the first time he had seen this problem on a C-Max. He went on to say that he rarely sees a C-Max for anything other than a recall or normal maintenance - they have very few problems. That seems to contradict the published quality reports.