Are there any R171 bodywork issues?

[Scottk]

Having just purchased an SLK350 on a 2006 plate, I wondered if there are any issues/ vulnerable areas for rust, that i should be aware of, as there were with the 320?
I know the 320 used to suffer with rust on the inner lip of the rear arches, which I believe was due to collecting mud on the inside of the lip.

Just want to know, so I can keep any vulnerable areas clean and protected.

Thanks