Join Date: Dec 2004
Bikes: 92 Giant Sedona ATX Custom
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You mention Magnaflux. IF you have access to it and a good skilled reader(the results can be confusing) then do so. The other method that is a little more available in the avation feild(and automotive) is Dye Penetrant, aka Zyglow.
I think you should be pretty well off by merely cleaning it thoroughly with a spray can of Brakleen, letting it dry and then examine with a 10x or so magnifier under bright light. If it is questionable, have someone with weld knowledge check it. Brazing is a very tolerant form of attachment, lugging is all the more. If it is separating(which braze generally doesn't) it is a simple matter of rebrazing it, which may not even involve more than reheating it.