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There are three parts involved with the defrost circuitry; the heater element, the defrost thermostat, which is mounted on the heat element, and the defrost timer motor. The element and the thermostat can be checked for continuity, using the ohm meter. If these components check out, replace the timer motor assembly.
My parts sources aren't responding to your model number. I may be able to help you find parts, if you send me the brand name.
According to information on the Viking website, your model has been discontinued, which accounts for the lack of parts information on the internet. The only information I can give you is a contact phone number. Call(###) ###-#### ***** press 1.