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The first obvious thing to do is to pull the BB out and inspect the insides. There are dye penetrants that can capillary their way through a crack to the other side you could employee. I've used penetrating oil and really clean other side for this.
Could this only be a paint crack? Sure but I tend to doubt it. Have you even pulled the post out and shined a light down the seat tube? Andy
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AndrewRStewart