I am not an expert in transportation by any means, so take my answer with a grain of salt. The answer I would pick would either be in green (only) during a pushback which includes engine start or in amber, during a pushback with an engine running. The research I was able to conduct on the internet on this topic only ever brought up a pushback.
If I were able to talk to someone who knew what they were doing, I might be able to narrow it further, but I cannot do that right now. A little more research that actually details why it comes up during pushback is needed.
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