Hello Lisa,
I love these cookers, they are beautiful.
FIRST OF ALL, REMOVE THE PLUG
Then pull the cooker out of its place and unscrew the backplate on the side where you think the problem is.
When it really is the ventilator, you will find then some very dark colored wires.
The reason for this is most often a bad contact.
When the wire is not burned to much, remove the burned connection, clean it and put it back again.
In case of a really bad burne wire, do not replace the wire, but use shrink hose
Just be sure that the connection is ok again.
Replacing Burned Wire Connection in Oven Mom in Music City
The second link is of a VW Samba, but illustrates what can happen. Then you can immagine that nothing will work anymore
TheSamba com Gallery burned wire