Good.

I had a feeling that it could be the N7 because only one side parking/tail lights failed and looking at the diagram the power coming into the N7 is not split by sides and it is the N7 that splits the power into individual places.

Also here's a link to a wiring diagram index for 1993 and newer W124:

http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/ETM/wiring_index.pdf

also check out the http://www.w124-zone.com/downloads/MB%20CD/W124/Main.html website. It has a factory shop manual for your engine, chassis, climate control etc etc...