Originally Posted by wandering_fred

I renewed in June after my first passport expired. Fortunately immigration lines were short.

I entered through the normal lines and (after asking for the enrolment center) turned right to head to the open processing office rather than exiting. I went in with new passport and qualifying FF program card. Process completed very quickly and they recognized that it was a "renewal" and finger prints were not taken as they were "on file".

Relatively painless.