Top portion of double-hung window has no support and won't stay up. Is this a simple fix? Assuming the cord may have snapped? I think they are either Pella or Anderson windows.
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Andersen 939 Narroline Sash Balancer - Amazon.com
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Lubricating Balancer Cords on 200 Series Perma-Shield® Narroline® Double-Hung Window
How to replace an Andersen Window Balance - YouTube