I would seriously get this checked out by the dealer, yesterday when the AA and I towed my selespeed back there was this guy before me in the reception who went 2000 miles over his 12,000 mile serivce and he was told flat out YOU HAVE LOST YOUR WARRANTY they allow 500 miles over and that's it.
This happened to my other half a few years ago on a 406 and she only went 36 miles over so we agreed NEVER to buy a car from them again, 2000 over yeah, 36 is a bit naughty.
Check it out as soon as possible they love to take your warranty away.
My car was serviced (156 1999 selespeed) when I bought it 15000 miles but I still brought it in for its 24000 service at 23000 just to be on the safe side, the milage was the first thing they check, then they don't say anything, service your car, give you the big bill, and tell you just when you're leaving 'oh by the way you've lost your warranty! you went over the milage sir and there is nothing you can do at all about it.