I recently applied too much cleaning pressure to the corner of my 2008 mbp screen and needed to consider replacing it. Fortunately the streak disappeared after four days or so. For those in a terminal predicament I discovered the following from an independent servicer : Apple do not manufacture LCD panels but buy them from 3 different manufacturers. I buy my panels directly from the same manufacturers so they are identical to those used by Apple. I can fit a brand new matte 17" LED 1920 x 1200 panel for £299. I know this is much cheaper than doing with Apple directly. I also found a number of replacement screens on Ebay and perhaps knowing there are 3 manufactures (Lg, Samsung and Chimei) will make it easier to establish if its genuine..