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The problem is that this is problem is one, at least partially, of internal corrosion.
Anyone who has dealt with corrosion of any sort knows, it doesnt sleep. So if you have something inspected and looks OK today, definitely no guarantee it will look OK tomorrow or the next day. I am also totally skeptical that the damage mechanism could even be spotted from the outside of the crank with bare eyes, and if you could spot it, it's way too late.
At this point, even if the possibility of failure remains "small", I would not regularly ride these cranks.
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