just to double check for slow leaks get a spray bottle and fill it with water add a little soap to it and spray the rim edges and valve stems. Get them good and soaked and look for bubbles. Don't forget the inside rims. Will be easier to take the wheels off the car to check them. If still no leaks, check all of your rubber the same way.
Still no leaks... off to the dealer.

let us know how you make out.