Red Triangle Icon

I have a red triangle Icon appearing on the dashboard. There is a picture of a headlight on the main screen. I did notice one of the amber lights was out.
The reason I am concerned is that the red icon appeared over a year ago. I checked oil & coolant & they seemed OK. There was no explanation in the manual so I drove the car apprx 1/2 hr to the dealer. I explained the problem & they took the car in for diagnostics. being a Saturday of a long weekend, they told me they did not have time to run the full diagnostics & that I should bring the car back on Thursday morning, They assured me it was safe to drive & requested I leave the error icon on to aid in the diagnostics. The engine burned out later that day due to loss of coolant. Repair bill $5200.00 (litigation pending).
If the amber light is the cause for the red icon display (this time), I will feel confident in driving the car for a replacement bulb.
Please confirm or deny this diagnosis.
Thanks
John