Anyone that has any idea what I'm talking about, any help would be appreciated. My RPTV has got what appears to be oil or water marks running down the screen in various spots. There aren't any discernable shapes (logos, lines, etc.) so I'm not sure if this is burn-in or what. They are only noticeable during a dark scene or if dark colors are on the screen. Does anyone have any suggestions, or any ideas what this is? Thank you in advance.