About 2 months ago I noticed some rust lines on the inside of my doors, almost near the bottom. It's about 1/2 inch from the inside bottom of the door, where there's a seam as the door sheet metal is folded over. On one door, the rust line is almost the length of the door, and on other doors, it's here-and-there, but always right on that seam.
The dealership told me the 5 year corrosion protection doesn't apply yet, because there's no actual perforation. They also said they've seen this before, but the rust hasn't penetrated to the "outside of the door" in the cases they've seen.
Any comments or experience with this? AND, suggestions on what I should do next? Seems like I should get this taken care of sooner than later...