I have a 15" rMBP I bought back in June. I have recently started to notice image retention on my computer. I checked and it is an LG display. I don't live near an Apple Store but next month I'll be in Las Vegas for about 5 days and there are plenty of them there. If I take it to the Genius Bar, will they replace the laptop or just repair it? Also if I have to ship it to Apple, anyone know about how long it will be before I receive it back?