They did. My guy looked at it and said it was just surface rust nothing to really worry about, but they knocked most of the rust off and coated. Once coated, it will deprive any left over rust of oxygen and prevent more spread. We'll see.
Found a ton of rust on the bottom of my new truck that I didn't notice before. It was raining all day when I bought the truck and I wasn't aware of reported rust issues at the time. Anyway, let my dealer know that I wasn't happy and they had the whole underbody coated for me. VERY happy with the...