I had Suncoast Designers rebuild three of my windows several years ago and they did a good job. They remove the entire window, completely disassembled it, disassembled the individual sections, fixed the seal, and reassembled everything and put the whole assembly back in the trailer. They rebuilt both the fixed and the movable sections in order to provide a complete lifetime warranty. Complete disassembly of the frame requires the astragal to be removed by drilling out the pop rivets and replaced with gaskets and pop rivets again. If only the moving panel needs to be fixed, that is easily removed by removing the plastic/rubber track material first then the window just lifts out. After they removed, rebuilt and replaced the windows I had to reseal the frame to trailer myself. Not inexpensive but at the time I had mine done they had a lifetime warranty. If you can rebuild them soon, before any etching takes place between the panels, they can reuse the original glass. They have a fairly large parking lot and nearly every spot has electricity and water so that you can stay in your camper. Also, there used to be a guy at Quartzsite during the big tent rv show that would rebuild windows but you had to remove your own windows and deliver them to him. I have never met him but I know of a couple of Oliver owners who have had windows fixed by him.