Nokia just say take it to a repair centre.
Mine is 4 days old , but my friends is 12 months and he has a stripe across his screen, although it is faint and can only be seen when in camera mode with something black against it !!
It does suffer and i hope a firmware update will cure it sometime soon.
Previous threads are on this site documenting the same issue.
Nokia n8.
iphone 4 16gb - black
Be happy !!