ther isn't much to do I had the same prob, but I scratched it myself with the craft knife while unpacking it from it's box.
I put on a sticker of dolby surround, luckily its not in the middle of the screen but just underneath the speaker.
I have tried touch up paint for silver cars, and also revell model paints but it came worse !!! :-?
Keith Ellul Malta, December 2004