Peachtree window sash

I have a Peachtree casement window sash that is pulling apart, The sash is aluminum-clad, and I can't figure out how to take the window completely apart so I can fix it. This ought to be just like replacing the glass, if you could get the sash apart.
Anyone know how to take apart a Peachtree sash? This is a vintage mid-80's window.
thanks, Tom
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