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Sagging lintel - bifold door

I have a bifold door that is jamming. Looks as though the gap has closed ie lintel sagging as the measurement in the middle is less than the sides. Also cracking in exterior plaster on sides which suggests movement. Interior seems fine have removed trim and nothing pressing on door frame, but cant see the other side obviously. Have removed gib to take photos of interior framing also which is pictured. Require someone to straighten the opening.