Because my aux fan failed prior to the recall announcement, my fan was replaced in late June. Since my VIN is subject to the recall, I had to determine if the replacement fan was a good part number. In doing this work I learned that the following two numbers, and some additional ones that I do not know, are good:
64-54-6-919-057
and the following, which superceded it
64-54-8-380-781
I have the 781 unit and have been told that no action is necessary. Since I have 3,300 miles or more on the new fan and have driven thru Mojave and the central valley, once at 116F degrees, I guess it is all okay.
I hope this helps some of you who are in doubt.