Engine alarm light on

[SFMEACH]

I am a newbie with a new to me '84 FC35. The engine alarm light has
come on a few times but not on others. All the gauges show normal
operation. This is the same coach that I had an issue with the buzzer
coming on intermitantly. Today the buzzer went off as soon as the air
came up to pressure but the engine alarm light stayed on. I think the
buzzer is either low coolant or the leveling legs not being fully
stowed in the up position. Unfortunately the BB manual is not much
help with the engine alarm since all it says on the topic is the light
comes on "when associated engine monitors detect and abnormal
operating condition". Any ideas on what the abnormal condition might
be?

Steve Meach
84 FC35
Paw Paw, MI