I had this issue, and had AppleCare send me a repair box. In ym reciept, it showed the aprts replaced, but no description. They replaced the keyboard and bezel because I had also told them about the discoloration, but there is one part number that is confusing me. APP-605-0994 SVC. I called AppleCare regarding this, and they didn't know what the part was, not even the supervisors, does anyone know what that part is? Also, when the repaired computer was returned to me, I had turned it on, and there were vertical colored lines that came up, so I reset the PRAM and it fixed it, but it does it every time i start the computer up. It is currently being repaired for this issue now. Could these issues be related?