I took advantage of the free, rust proofing that Mazda was offering to some 2006 vehicles and my dealership found rust behind all three of my tail lights. Everywhere else the car looks great and I couldn't find rust no matter how hard I looked. This had me pretty worried but I just found out today that Mazda Canada will be paying for it to be completely fixed by a local body shop.
If anyone hasn't taken advantage of the free rust proofing for their vehicle I highly suggest it.