Hi Stefan,
I've actually both a SN B040000 and up newer version, and an older one.
They're both non-working and restauration projects.
However, I've taken a quick look already, and if I remember correctly, the PCB are actually same.
But with the enhance/integrate switch/potentiometer combo not installed (holes are there!).?Otherwise components seem same.
I can have closer look if you want.
BTW, do you have the newer version's manual? Tekwiki only has the older one.
Best regards,