I just had my 2014 at the dealer to get this 5-3 downshift noise fixed. When I dropped it off I old had 2 weeks of my 5 year powertrain warranty remaining. My service advisor laughed when I said this. I took him for a ride around the block when dropping the truck off to replicate the noise, to make sure he could hear it. I got my loaner Lincoln MKZ and was on my way.
My dealer only has one transmission tech, so diagnostic took a couple days. The tech determined the transmission needed an overhaul and I was told everything should be covered under warranty. Total repair took 1.5 weeks. My 3 page receipt has an entire page of part numbers that were replaced including clutches, steels, 2 solenoids, gaskets, nuts/bolts, etc. Everything was flushed out because there was a lot of clutch material in my fluid according to the tech's notes. The tech replaced everything that showed any kind of damage.
Everything was covered under warranty and I paid nothing.
That noise has gone away and everything is much smoother. I can barely feel any of the shifts now. I'm happy the noise went away,and that everything was covered on the final days of my powertrain warranty.