Thanks for the assistance re illuminating this panel as well as P6. I had searched the manual for every phrase I could think of and couldn't find the magic lighting button for them.
Perhaps we should ask Hardy to implement a keyboard-activated, mouse-driven virtual flashlight?! It would need to be added to the other functions of the mouse, and then deactivated by keyboard when not needed. Easy for me to suggest, of course. Somehow I suspect Hardy's priorities for modifying PSX already has quite a few much higher priority items in it.
I assume that real pilots would use a real flashlight if they needed to fool around in those panels at night...
On the other hand, it's probably a bit unusual to test squibs in the middle of the night out over the Pacific or Atlantic or North Pole! Maybe it's just as well they live "in the corner, in the back, in the dark".