DEC MicroVAX 3100 Owner's Manual page 115

2. Make notes based on the troubleshooting chart at the beginning
of this chapter. This information may tell your DIGITAL service
representative the state of your system when the problem occurred.
3. Be prepared to read information from the screen and to enter commands
at the keyboard while you talk to your DIGITAL service representative
on the telephone.
4. Eight recessed lights on the back of the system unit light up when you
turn on the system. Write down the status of these lights and have the
information available to give to your DIGITAL service representative
when you call. Your DIGITAL service representative may ask you to
describe which lights are lit.
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MicroVAX 3100 and VAXserver 3100 Owner's Manual