Just recently I've noticed paint bubbling behind where the wing mirrors mount to the doors. It's probably been there ages but I've only just seen it. The main reason for my post is to let you guys know, that Nissan have agreed to repair it under the corrosion warranty. My car is an 09 plate so it's coming up to the end of the corrosion warranty and they still agreed it without quibble. I've searched the net and found several people with this problem, even on older 350s. The place I took mine to is Grove autos in Beckenham as they're an approved Nissan warranty repair place.
Get checking those doors people. I'm sure I'm not the only one with this, and you'd be mad to miss out on a possible free repair.