Bianchi Auto-Milano nexus manuals?
 

Greetings,
I have obtained a Bianchi Auto-Milano Cafe Racer bike with the Nexus automatic shifting. I think it is called the Auto-D. Since this bike has been stored for a while, I am wanting to get info on how to maintain this bike properly. A search of the web revealed some stuff from Shimano, but I would like to know how this is supposed to function. There is a device on the handlebar, one by the bottom bracket, and of course, the rear hub itself. Is there any info. out there on what the functions of these pieces are, how they are supposed to work, how to maintain them? Thanks for any help!!