Well I got my rMBP replaced because of ghostning, backlight bleeding..... Let's just call it crappy screen.. My new one is LG and has same issues. I am going to get another replacement. I just have to go back to the store with it. But there is something else too. The drive only scores 350/350 on BlackMagic Speedtest. My last one scored 500/500.. How can I find out which drive is inside?