Replying to Can I tell if my core is rotten?

So I got a coreshot a couple of seasons ago and got it repaired at a shop. Since then the ptex has stayed in but at some point cracks started appearing in it so it looks like water has been getting in for awhile. Now the same ski has gotten another core shot but am not sure it's worth fixing a ski that will snap any moment.
So I'm wondering whether there is a way to tell at home whether or not the core is rotten. Or if, based on the situation, there is any way the core hasn't rotten.