Follow this link and the fourth or fifth post tells you how.
http://forums.swedespeed.com/zerothread?id=31704
How much cheaper was the service outside of the dealer? The only reason I'm staying in with them for the next couple is if any software upgrades come out. I noticed after the last one that the menu's on the display unit were updated so it got me thinking that some other things may have changed as "improvements" were developed.