That's a tough one. Basement storage of the wine like you noted should be perfectly fine. My cellar is just the corner closet of my basement and my wines have been great over the past 10 years like this. The temp ranges from the same as yours very slowly over the course of the year.
It almost sounds like your bottles could have frozen at some point to cause the cork problem? My only cork leakage occured that way. The other problem could have been extremely low humidity drying out the outside of the corks. Do you live in the arid southwest?
I doubt very serously that the winery would take your request to get new bottles this far from the purchase date but you can always try.
We would really like to hear what you have to say
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