GE Profile igniter won't spark

I have a GE profile XL 44 Range (JGBS23WEW3WW). One of the burners on the cook top (right front) no longer sparks to light the gas. When I turn the offending knob none of the other 3 burners spark. When I turn any of the other 3 knobs the bad burner will spark too. From reading through the other forums it looks like I need a spark switch? ,not the ignition module? Do you know what part I need? Also some basic instruction on where this part is would be good. Is it at the knob, at the burner or somewhere under the cooktop?