I had the exact same issue, and it's driving me f'ng insane. I took it to the dealer (showed them this thread) and though I had to be a bit aggressive to get it fixed, they did everything recommended above. They acknowledged that the noise was heard and even suggested that this above-mentioned fix didn't necessarily solve it, though they did perform it. They said they had to do other fixes (details were hazy) to solve it. I drove it out, and it was ok for a few days.
The noise reappeared, BUT WORSE, yesterday.
I am so f'ng pissed right now, and though I don't want to have to do this, I might have to commence lemon law proceedings. I am a lawyer (though not in this field) but don't have the time for this BS anymore.
The dealer was very good -- but not great. I'm probably going back there for another round tomorrow just out of courtesy to Ford, though I'm sure they're getting pissed at me now.