I don't know about that engine but some times the techs that design and make these things add funny things that they use for testing or just playing around. They are never meant to show up in the real world but a stray spike or other strange happening can cause them to show up. No problem when it happens, just turn it off and on or otherwise reset it and you will probably never see it again. We had an engine that started ringing just like a telephone once. Never did figure out how to answer it.
Al
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