SIMPSON NEPTUNE ATLAS SERIES 4 ELEMENT ELECTRIC COOKING STOVE?

Hi,
For the above ELECTRIC COOKING STOVE one of the element was not warming up and the the toggle switch "Grill/ Bake" operates only intermittently. Presently the oven below is not heating up nor does the switch indicator light turn on. Could some one help please. Have fixed the loose connection of one of the elements that did not make proper contact. How do i approach the oven elements. Do i have to open the rear?
Thanks