81' 380sl Headlight help

[warviking]

I have an 81' 380sl with headlights not working. Brights work fine but both headlights are out. Sadly I know very little about this car and the manual is currently missing. Can somebody tell me where I should start trying to fix this problem? Searching the forum I thought maybe it would be the fuses. They look ok. I could use some help on just how you check the headlight bulb. Is the light completely replaced or can you just change the bulb? Also are there any books out there that would help with maintenance? Thank you.