Most likely, the lack of illumination is just the bulbs. It'll be cheap if
you're able to pull the panels and replace them youself. If not, be
prepared to spend some significant labor money.
Check your lighter to see if you have power in the center terminal and
ground on the outside. If so, you need an element. If no power, go back
and check the cigar fuse in the interior fuse block. If neither power nor
ground, you're probably unplugged behind the panel.