Have any of the Geniuses given you an issue over getting a replacement for backlight issues? Are you finding that they have replacements in stock or are they having to order them? How long is it taking to get the ones they order? I'd really like to get mine replaced, but I worry about getting one even worse than the one I have now. If I do get it replaced, I'll probably have them power it up & look at it before I leave. How is everyone else faring with replacements?