Sagging window frame - can't remove sliding panel

Hi All,

I need to remove some aluminium sliding window panels to replace rollers and clean them up. But it appears the lintel has sagged which has in turn pushed down on the top of the window frame and there is not enough clearance now to lift the sliding panel up and out.

Does anyone have any ideas on how I might be able to get them out? I was thinking I could use a car jack to push the tops and bottoms of the frame apart enough to get it out? Tried searching but didn't turn up anything. Surely this has happened before?

Thanks,
Wayne


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