Gibson CS

I have an Epiphone Masterbilt DR 500 MCE VS I bought this May 23rd from MF and after a busy summer of playing on stage at summer festivals the guitar is showing signs of warping. The back is caving in(tho solid to the touch) and the neck seems to have couple of bends right now. How do I go about having warranty fix my guitar? I also own a Casino that is a great guitar and in great shape.

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