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Hi Robin,
How long has it been like this?
Are you talking about half way along the left and right side walls in the photo?
Usually water on gyprock will leave a stain as in colour difference after a while. Also depends on how much is getting through. Any stains?
Looks in the photo that you have a bit of sagging between the ceiling joists. ie. ripples.
Also it looks as though something like a beam above is actually pressing down on the gyprock. Causing the sagging.
Do you have a ladder and a manhole to gain access to the roof space? Other idea could be to use your stick and canon and get a photo of whats above that area.
Can you also please send a close up of the sagging area?
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