Everett, it's not the ceramic plaques that are causing the problem, it's the burner that heats the plaques that's failed. Replacing the entire burner assembly is your only option.
It's interesting that you are still using that model Fiesta Gas Grill. It was recalled about 3 years ago.
http://bbq.about.com/b/2009/07/21/recall-alert-fiesta-blue-ember-gas-grill-2.htm but not for the problem you're having. If your model number is not mentioned in the link above. Don't worry about it.
You may be able to find a replacement burner from Fiesta or try Appliance Factory Parts
http://www.appliancefactoryparts.com/ Be sure to have the correct Model Number of your grill when looking for parts.
Hope this helped you. Please let me know and Happy Grilling!!
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