I have an '03 and the left rear tire loses about air at the rate of 10# per week - the goodyear runflats have only 7,000 miles with no apparent nails/valve or such causing the leak - would I be better off going to the dealer or a goodyear store to have them resealed?

 

You don't need to go to a Goodyear store (any tire store that can work with runflat tires will do), but you may want to check with your dealer to see if something like that would be covered under warranty.

 

After I had new tires put on I had a constant leak from one. It ended up being the valve stem not being tight enough.