When I opened the hood of my 560, I noticed a small rust spot -- size of a quarter on the left side of the front brace/frame that is directly in front of the radiator. I scraped and poked...and it appears to to be only very slight surface rust -- nothing crumbling -- everything is solid as could be. I know that any rust is a concern, but is this a really big concern for me that needs immediate attention? And, what is the best way to fix it -- sand the area down, and repaint? What do you think a body shop would charge to fix such a small area like that? thx in advance!