Hi, Steve:
Here is the address you're looking for:
Canon Factory Service Center
15955 Alton Parkway
Irvine CA 92618
(949) 753-4200
Incidentally, you can get this information and a lot more from Canon USA's web site. Each of our products has a Support page that contains useful links to software, manuals, and repair information. Here is the URL for the EOS 10D's Support Index:
http://consumer.usa.canon.com/ir/control...mp;modelid=8772
Hope this helps!