Sorry I'm late on this but just read this. I have a 2010 F150 XLT. I know it is not the same as yours but I had transmission leaks for 3 years. I brought it in each time and it would hold and then lead again a year later. The culprit was cold weather and the bulkhead connector. After some research, I found out about the bulkhead - a Ford known problem with a TB (Technical Bulletin) on it. As I recall it has to be the orange one. I actually brought the research to them because just the seal was being replaced the first two times and the third time the wrong bulkhead connector color.
I know I should be real upset with them but they worked with me all the way through with no charges, even when out of warranty. Should they have known, yes. We've gotten to know each other well over the years. I get VIP treatment when I go for regularly scheduled maintenance from the ordeal. I'm just happy there was a real resolution to this problem for me.
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