Lights out on Climate Control Console 2000 Trooper

On the climate control console in my 2000 Trooper, the back light that illuminates the interior temperature setting and climate control mode buttons is out. I took it apart yesterday but couldn't find a smoking gun.

Anyone else run into this problem? I checked all my fuses - none were blown. All other interior lights work, including all those on the dash. No loose wires or connections. Is this a bulb or an LED?

Any help would be appreciated.

Thanks.

Looking at my crappy schematic, they appear to be incandescent bulbs.