i would replace them..
Crackes mean uv damage and it will move or also be in the main ply of the tire ( there are now exposed to outside environment. If your short on money replace the fronts first. Also remember one tire blowing out on rear could blow the other out on the same side and cause damage to body and air bags. Always keep you tires in good condition. One more thing i believe 5 years is all a manufacturer is required to warranty them.
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