Hey gang, We are about to receive our window replacement for the 70' airstream...we have the original owners manual...which I will re check before the window gets here....I think the riser (metal) arms have to be un-done to take out the broken window...where do they release from...ours (those two metal arms) seem to have a film of rust on them and will be spraying with WD40 to soak so that whichever end comes loose, it will be easier..so thats the question, is ---what has to be undone before the window is lifted out?