yesterday two of the four burners of the stove top worked only some of the time. Today those two will not ignite at all. The snapping sound happens whenever I turn any of the four burners on. I took the heavy caps off the burners, and there is spark to ignite the right front and left rear burners only. Could a wire be loose or should I look for a part to be replaced?

And, how do you remove the stove top for access?

Thank you.