have you tried asking at either:-
mitsumi.co.jp or mitsumi.com
Both these websites have contact us links.
You do not advise why you need the guide, but does this help:-
Bear in mind when there are problems with cd/dvd drives, they are generally considered throwaway items. Here in the UK, a cleaning kit for such costs a £1 in a cheapo shop. The kit with the cleaning liquid is best.
Please advise back on progress.
Good Luck - Keep us posted.