I have a 2015 Edge Titanium AWD with the 3.5L engine. I have about 17,000 miles on it. Before the summer my mechanic (non-Ford) was doing an oil change, and noticed some oil on the outside of the PTU. He wasn't sure where it was coming from, but told me to have Ford check it out. I didn't have time during July and August, so I just got it to the Ford dealer today. They checked it out and told me that they will replace the PTU free of charge, but they will not be able to get it till early October.
At least they are replacing it for free without giving me a hard time.