Sounds like your dealer is teaching its mechanics how to work on your truck without sending them school while charging you a $100 an hour for the experience. As said below a no start situation should be an easy diagnoses (albeit ptobably an equally expensive repair). The problem is most Ford dealers have one or two certified mechanics and the rest of the shop are high school dropout car washers playing the part of a "mechanic" and don't have a clue what they are doing - while the dealer bills you $100 an hour for their time.
I drove Fords my entire life and even came home from the hospital in one but the local dealer cured me of ever buying a new one under warranty again. The last new Ford I owned was a 2006 Freestyle. I brought it to the dealer (only place that would touch the transmission) at 60K to get the transmission serviced, between the actual service and the repairs to fix their mistakes it costed me over $900 and three days out of service for the fluid change. I decided then I couldn't afford to buy another new Ford and traded that POS in for a Kia minivan for my wife. 100K later that minivan has been more reliable than any Ford I've owned in the last 30 years.