Looking for manual: Video Tech Designs VMX410 / VMX400 video-mixer

As the title suggests: i am (quite desperately) looking for a manual and/or cheat-sheet for the Video Tech Designs VMX410 video-mixer - it seems that the VMX400 manual should do also, as it is the same video-mixer without the audio-mixer-part.

I do have the machine (VMX410), but unfortunately it is unusable without the manual as it requires numeric codes to be entered to be used…

…any hint or help is greatly appreciated.

Thank you in advance.