Hi,Welcome to Just Answer, My name isXXXXX will be helping you with your appliance issue today.
you can fix this yourself, you need to replace the light switch,
this plugs in. what you need to do is first shut the breaker or at the box and then take a thin putty knife and push in the little gold clips that hold the switch in while working the switch out. be careful not to get the plug caught and let it come off before you get a hold of it, this can fall down into the side wall of the oven and then you will need to take the oven apart to get the plug, you can order this @ http://www.repairclinic.com/PartDetail/Switch/253125?modelNumber=JKP16GP2BG hope this helps, thanks Bryan
Does this switch just plug in; is there a special orientation of the new plug easily visible.