window stuck open

A home owner from Hawaii says:
I have 3 windows H-LC30 that are stuck open. Afraid of breaking them if I push any harder. What do I do?
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Tom from SWISCO responded:
That would depend on a lot. Can you take a couple pictures of the windows? I wasn't able to match that serial number to anything. Do you also know why they're stuck? If so, take a picture of the problem area and we can work from there.
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