I literally JUST got back from my 3rd visit to the Apple Store. I had to pick up my MBP, it was getting a keyboard replacement for a malfunctioning spacebar. Just when I thought I was in the clear FINALLY, I went to turn my screen brightness up and what do ya know... Nothing happened. It seems that all of my special function keys except the volume ones (F1-F9) do nothing at all. I have also noticed that my right shift key doesn't work. I haven't discovered them yet, but there could be more. I already called Apple Care and they are telling me I have to take it back in for another replacement keyboard. I live 45 minutes away and I reeeallly don't want to have to go back 2 more times. Please MacRumors, HELP ME!