What does the Operation and Maintenance Manual say?
What was the outcome of the telephone discussion with the original equipment manufacturer?
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Is the equipment still under the Original Equipment Manufacturer's product warranty arrangements?
What has been tried so far?
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Are there other users nearby who can help?
Are there people in wider networking activities that can help over the 'phone?
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
The Emerson / Motorola MVME6100 Manual defines the yellow BDFAIL (Board Fail) LED as an indicator that the single-board computer has detected an internal hardware failure, self-test error, or a system-level fault condition. Having the BDFAIL LED lit while the equipment is running is not normal and typically indicates that either a hardware fault has occurred on the board or software has explicitly asserted the fail signal due to a detected exception.
It is not reassuring that you do not realize something is wrong, unless your programmer was derelict.