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OK John .............. dunno how Post-Op has got time for this .......... he's engaged now :o)
Sagging is where it's become detached from the ceiling joists. As Postie says, cut out this part ............ keep cutting until you get back to an edge that is still securely attached. Replace with new plasterboard, and re-finish with plaster.
The important thing is to not bother filling the crack. It'll keep coming back, and eventually end up on the floor.
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