When I bought the truck the sunroof switch lit up the two triangles, every so often if I press the switch, the light comes on, now they wont at all. Actually a couple of times when I rapped the switch the Nav screen went blank!?! Won't do that again. Can the switch be replaced? Is it something a backyard mechanic could do? The front pass window switch and rear pass window switch both do not light up as well, something to live with or worth fixing?, thanks, Doug