I'm in the process of cleaning up the interior of my '71. The panel in the dash above the console is giving me problems. I have the four screws in the corners out, the fan switch off, but the heater controls are still holding the panel in. I've checked all the service manuals and they are no help. I can peek around the back and see the heater controls screwed into the panel (I think). Do I have to find a way to get those out, or is there some easy way I am overlooking? Thanks.