This morning while hopping into the '91 560 SEL, my "lamp-out" indicator light came on (when I switched on the lights.)
The front and rear pass. side parking lamps are out and the interior switch back lighting (center console switches and rear door switches), radio light, and intrument cluster light are out as well. All elec. options function properly. Obviously not a fuse.

Yesterday AM, while walking out in front of the car, I thought I smelled "ozone". -- But the lights still worked later in the day...

Any ideas on this one?

TIA!!!!!!