[morzh]

There is a risk to that though. Yes I've seen it happen a few times also, but this is mostly due to oxidation, when you see the green copper, and when you fix this, you cannot be sure the oxidation has not progressed beyond that point and won't break the wire again soon.
One hope is, the oxidation might be due to the flux residue, and so it is limited to the solder joint, but also might be due to moisture.