Roland HP-860 service manual/schematic diagrams

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Where can I get a service manual for this electronic piano ?
Where can I get schematic diagrams for it?

As all the PCBs are single-sided (phew!) I could map them out, and come up with the cct. diagram, but it'd take a while,
and it already exists, I just don't have it!

No point in reinventing the wheel!

I've searched Google, and found very little on this model.

Thanks in advance.
-Joshua

[Maschinengeist]

Hi Joshua

I've placed a request to one of my suppliers for the service manual. Usually, I should hear from him in 2 days max.