is there any way to make the grey bars on a TWC SA8300HD with passport black? One of the reasons I bought the TV that I did is that it doesn't have any burn in issues, and I would much rather have black bars since the grey ones (that change brightness with the program) are very distracting.
No there isn't unfortunately. The Passport firmware needs to be updated to add a menu item to select the sidebar and letterbox bar color like the SARA firmware supports. Complain to your cable company and request that feature for the next firmware upgrade.