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

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.