Mando (or is it Fish?)
If your stanchion "holes" have water in them then you should check for rot.
If it were me and I was worried about this I would remove the stanchion bases (and while removed take care of the problem above). Then I would over drill the stanchion holes. If the shavings (tailings?) coming out were reasonably dry and solid then great! Just fill with thickened epoxy, redrill the holes and remount your stanchion base using a high quality sealant. this way if it does leak again in future your deck core will be safe.