Thanks for the reply guys...
I will check all of the lights, including the plate bulbs first thing in the morning. I did replace the OEM headlight bulbs with illegal diamond blue headlight bulbs (same wattage). I put these illegal blue bulbs on a couple of months ago--never had a problem until now. I will put the OEM bulbs back to see if the "exterior light failue" will go off...once again, thanks, much appreciated