A dark but transparent horizontal line has appeared about 20% down from the top. Any suggestions? Originally there was a dark horizontal line almost in the center of the screen. I would go away after of few hours of the tv being turned off. As the scenes changed a bright spot would appear on the right size of the line-it almost looked like light shining through a slat in a venetian blind. Now with this ribbon like area, which is about 2 inches wide, an area on the right side about 20% in from the edge seems to retain part of the previous scenes images and colors as the scene changes. Any suggestions as to problems and costs of repair would be appreciated. The set was purchased in May of 2008 Thanks.