Found some more information now, but in German.
http://www.r75.info/ftp_root/admins/...DENT_JATCO.pdf
It looks as if the sticker is on the front of the gearbox below the filler bung and there should be a stamp also with the pr number which looks to be on the top of the gearbox somewhere.
Sorry that I dont speak German so cant translate.
But confirmed yours should be PR002 or PR012 according to this.
Matt