Fanuc 10M tower lights

[Swemill]

On my Kitamura Mycenter with Fanuc 10M i have a tower / warning light with red green and yellow lights. The red light works with alarms as it's used to do on cnc machines but when works the yellow light?
I have seen this light sometimes "spin" (for only some seconds) when the machine is on and stands still. Can't find any info on this and the screen tells me nothing....
The green light have also never been lightened / spinning as thought it should when i run a program!?

[fordav11]

The traffic lights are usually optional extras and simply wired into some connectors that are powered at specific times.
In normal operation red is for alarm, orange is program end (i.e. M30) or M00 waiting. Green should be on when the cycle runs. Since the lights are on the machine it should be configured and working. If they don't work as expected perhaps the globes are bad?