Century 21 A/P - how to exchange light bulbs?

[NicoN]

On our Century 21 panel , the "AP" annunciator bulb failed . All others work, but I guess they will follow to electric heaven.
If I press "Test" HDG, NAV and so on light up, except for "AP". The A/P itself does what it should.

Our shop gave us an insane quote and an even more insane timeline to replace this supposedly burned lightbulb.

So, today, I tried to pull out the handling panel from the center stack, assuming it has the same mechanism with a 3/32 hex key.

But it seems not so easy.
THere are 2 little holes in the front cover, behind is a screw and a nut. I can access them from the underside, but the opening is small and does not allow a wrench

I can turn those screws only by about 150°. So, i think that they unlock the device from the panel - but it does not work . The device does not slide out or even seems to become loose.

Even better would be if I can just remove the front cover, but I did not find any clips.

Can someone help?