Good news, i was able to get a copy of the JMDN code list! I contacted a gentleman in the Japanese Office of Device Evaluation who gave me a link to it. Of course it is only available in Japanese, however with yahoo's babel fish website i was able to translate english to japanese and do a document search to find what i needed.
Most numbers are the same as GMDN codes plus three zero's as mentioned in an earlier post about this topic. However there are only half the pages of the GMDN code list so you might not be able to locate your code. If not good luck, you will really have to work with a representative and Japan from that point on.
Anyways, im unable to post the list because i havent posted enough apparently, so if you need a copy of it reply to this post with where you want me to e-mail the link to and i'll send it.
This took me about two months to track down! And in doing so i have learned alot about the Japanese Regulations, but i still have much to learn.
please enjoy!