The title of my question is a little misleading: I'm not actually taking my old 27-inch Panasonic to a calibrationist, but a regular TV repair person. I've got a problem with a green hue on the picture so I'm hoping this guy can adjust the green gun/grayscale to fix it. But I imagine he'll access the service menu, and my understanding is that there are factory default settings in the service menus of most TVs that should be changed to optimize the picture. I'm not exactly sure what they are, so I'm hoping for suggestions. What are typical default settings in the service menu that should be changed? What, other than tweaking the green gun, should I ask this repair guy to do?