OK. I searched long and far, high and low to try to provide you with the information you are asking for.
Apparently, this Italian-based company does not make service information readilly available to the consumer. The only thing I found on the Delonghi corporate site is the User's Manual for your machine. If you do not have a user's manual, click
HERE to get a copy. (PDF version)
The User's manual does have toll-free numbers listed in the last few pages that you can call for service information and replacement parts.
I also found a web site that lists most of the replacement parts. Although they have actual photos of most of the parts listed, I did not see any "exploded view" to show you where each of the parts are located. They do however, have a listing at the top of the parts list for a CD. I assume this CD will contain an exploded view and a legend to show you which part is which. Click the link below to go to this web site.
Delonghi EAM3500 Replacement parts