how to check if it's a brace
I'd take the strings off and get your hands in there. See if you can get some vibration by tapping on the braces. If not, you've got something else causing the buzz - and there's a very comprehensive link in Frets.com (referenced here in another "buzz" thread)
Martin makes a good point on the type of glue being important. Hide glue will adhere to itself, so getting it good and hot and applying it under a brace with a modified putty knife (apparently drilling holes in it will give the glue somewhere to hide as you slip it under the brace. I've never done it, and it sounds like a challenge for people with small hands and double jointed wrists, but that's my understanding of how to do it. Oh and yes, the clamps described are necessary.
Titebond doesn't adhere well to itself, so if it's titebond on the braces, you'd need to carefully sand the brace and underside of the top clean if there's any glue remaining.
Good luck!
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