Managed to get hold of an iPhone 6 Plus 128Gb Space Grey yesterday in store. My online pre order is still saying 3-4 weeks! I brought it home, set it up and found two dead pixels, one that shows on white and one that lets the colour out on black. I'm thinking of taking it back today for replacement which should be fairly straight forward right? Will I need a Genius appointment? Do you think they will have white box stock to replace? And would I need to go back to the same store?