Half a burner

I’ve owned a Maytag Gemini dual oven with a glass cooktop. Recently, the right front burner stopped working properly. This is the burner that can be used as a large or small burner. The larger outer part of the burner stopped working, but the inner, smaller burner still works. Do I need to replace the whole burner or is there another part that needs to be replace?

Thanks in advance for your help.

Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=MER6770

Here is a manual which should help with your repair.
http://appliancedigest.com/index.php?/files/file/506-16010107-maytag-gemini-range-service-manual/
You have to join the site to download the manual but it is free and this is a very good site for manuals and other info for the appliance repair DIYer.

Easiest is to remove the element and check it with a meter though often you can see where it is burned out. If it and the wiring going to it are OK I would replace the infinite switch.