[Wallace River]

From your picture it looks like surface corrosion, which likely has a different warranty coverage than perforation. I worked in the industry for years and the company I was with had a 3-year surface corrosion warranty and a 5-year perforation, or rust-through warranty. Panels that rust through generally do so from inside out. Surface corrosion can rust through of course too, but since it's visible it should be repaired before it gets that bad. That's kind of up to you if it's past the manufacturer's surface corrosion warranty. Your car is 10 years old now, but I don't know what Porsche's surface corrosion warranty was. Not likely 10 years. I'd say on a 10-year old car you're asking a lot for any manufacturer to take responsibility.