Number of relays and other questions
 

I'm troubleshooting electrical gremlins in my 1983 MB 300D. The rear defrost and console lights don't work.

I've replaced all the fuses. I've replaced the console bulb. I've verified the rear defrost is wired.

Maybe a relay is out? How many relays are there in this car? Are they fairly straightforward to replace?

Are there other troubleshooting tips for this type of gremlin?

TIA,

JJ