What's the Apple Warranty in the iPad 2 Smart Cover

I bought a smart case for my iPad Air 2, I also bought the AppleCare++. I am experiencing some type of degradation in the plastic holder, this one isn't securing the iPad strong enough as when it was new. What is the process I should follow to get this verified and eventually get replaced. It is evident that resin of the molded plastic had a fabrication problem.

Thanks in advance for your help to answer my question.

iPad Air Smart Cover

iPad Air Smart Cover

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