Is the rust on the inside or the outside of the doors?
My 2012 Yeti had zinc "inclusions" on a rear door. They appear as a crackled blister from under the paint. The dealer claimed ignorance and had to be "educated" but the door was repainted, I know of another Yeti owner who had all four doors replaced under warranty as his were so bad. They need to be reported before they "pop" or the dealer will try to dismiss them as stone chips. They were caused by the doors not being cleaned properly before painting and are normally below handle level.
There have also been some cases of rusting along the inside of the door where the edge is turned over.