I'm looking at various documents about trying to remove just the screen on the 16:9 navigation, but its not very clear, it seems like there are 4 screws holding it, but I only have access to 2. None of the docs I see say you have to take any interior panels out. Do you? They also mention about a "cover frame" just sliding out to expose the 2 back screws? What portion is this? Nothing I see here seems to allow for just pulling it out. Any help?