Do "N" units have an "N" model number on the About page or it only a stock differentiator?
(I thought Apple went out of their way to make it hard to spot a refurb because people were paranoid about them - remember when refurb serials used to start with 5K but not anymore. Having an "N" model number on the About screen would fly in the face of that!)
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Well a guy on the previous page said his replacement had the same "issue" so on a sample of two you've got a 50% success rate - I don't think we can draw a conclusion...