Help With Dash Lights Please...

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I was wondering how to remove the dash lights(where the rear light switch, a/c knob, and rear defroster switch is. The lights for the rear light switch,a/c knob, and rear defroster do not light up and I wanted to fix them.(DO THEY EVEN LIGHT UP?) If anyone knows how to replace the bulbs so they work please help. The rear defroster button only lights up when I turn it on when it's off it does not light up but on my 1977 300D the button lights up even when off. (I put brand new fuses in so I know it can't be a fuse)

Here's some pics. to see what I am talking about: