Cyber CL logic board LED's

Good evening,

I wonder if anyone can tell me what the 3 LED's on the front of the logic board for the cybers stand for?

There are LED's,

yellow - red - yellow
LD9 - LD5 - LD6

Also, how can these help me troubleshoot, as some of the boards I have have all on, and some only have the yellow ones on.

Thank you in advance,

Alexis
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