Hi all – You have helped before, so I’m hoping someone out there has an answer to my latest question. I have a house with 18 year old wood, tri panel, casement windows. The manufacturer is Marvin. The two outer panels crank open. The center panel does not open. There are two problems with the center panel. First, the weatherstrip that is supposed to surround the center window unit, appears to have completely deteriorated. So there is an open gap all the way around the panel (which measures about 18 inches by 5 feet). Second, the sill beneath the center panel is rotting. Since a new window is very expensive, I’d like to remove the center panel, repair the rot, and replace the weathstrip. However, I have no idea how the window is attached to the overall frame. It does not appear to be screwed to the frame. I can’t even detect any sign of nails. Could it actually be glued? Could it be possible that you just can’t remove that center panel? I guess I need someone who is very familiar with Marvin windows. Any help would be appreciated.