locating ceiling cable grid

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Moderator Post (s) for this thread: > Ceiling electric grid by Billhart on 01/12/2009 > Locating Cables by thiggy on 02/11/2009

I have ceiling cable heat. I have an area of dry wall that is sagging. Has come detached from the studs . The area is about 36x 36inches. We need to renail the dry wall and patch plater. How do we find the cable wiring, so we can nail drywall back up?