They're all ganging up on you! At least you now know and can do something about it.
I sanded down the high area, but the "wood" in that area doesn't sound right, sounds like tapping on balsa wood (see video).
Just a guess on my part, but I reckon when the holes were being drilled, they had an accident and patched this section up (hence no hole going all the way through), with what I do not know.
In the same area, there is a greenish patch, could it be some kind of bog? Probably not the greatest place to have a soft spot.
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Is there any sort of a hairline fracture in the end grain there? It sounds like a separated section or a perhaps a partially filled void (hairline) under that little brown/green section?
Maybe wick some thin CA glue into it along that dark brown line and see if that makes a difference?
FrankenLab
Hand crafting guitars, because Death Rays are expensive.
Possibly a growth inclusion from the trees earlier lifeor something then? Go easy on the CA glue at first and see how it spreads/wicks before you get too heavy handed with it (he says sagely, like he’s never glued his glove to a guitar and had to sand it off).
FrankenLab
Hand crafting guitars, because Death Rays are expensive.