Ok so I found out how to get the diagnostics page up on the Nav screen and I know that I can use code 917 or 1971 and they give me some diagnostic options (mostly surrounding navigation). Are there other codes I can enter on this page to run diagnostics on any other systems? For example I think I recall a way to run AC diagnostics through the AC screen on my XK8. So is there any other cool stuff like that I can do on the Nav screen?

What would happen if I entered a random number or mistyped 917 or 1971?

Thanks,
Alan