Here is a good way to know if your freezer ever went above 32 degrees. Put a small container in there of water. Let it freeze solid, and then place a penny on top of the ice, and put it back in there. In times like these get the penny out and check if it is somewhere below the surface plane on which you set said penny. If it is your freezer has gone above temp for a period of time and then refroze. Simple, efficient, and effect, tattle-tail alarm for your freezer.
I myself would thaw them, smell them, and see, if it passes my sniffer, I would then run it under the wife's nose, women have a heightened sense of smell. Last I would run it under my Beagles nose, and if he stats to growl and tries to snatch it, I know it's good. After that I would cut off a section cook it up, and try a piece of it just meat no flavor or smoke, a small piece on your tongue should tell you what you got, if its funky spit it out, and pitch the ribs. If not, start the process and have fun. Lastly if the rack of ribs are bad, well the Beagle got his way, and will have a feast, and then have to stay out in the garage for the night, don't want to have to clean up his mess.
BTW, Walmart had full slabs for $7.99, so it might not be worth the risk, that's a cheap price compared to a night of pain and anguish, with the potential of never eating another rib in your life!!!!! I won't eat scallops any more for just such a reason.