1999 Buick Lesabre Dashboard lights

How do you change the dashboard light bulbs? - The radio knobs that control left/right and front/back plus the heater and A/C buttons. The are probably more "courtesy lights" not showing operation of the button. Everything works, just the bulbs are burned out and at night half the manual HVAC control panel is not illuminated for control, have to turn on an interior light, usually the light in the rear view mirror.
Any manual or diagram to get behind the dash to change the bulbs?