Vintage Synth Repair

Hi!

I've searched for hours for the XR10 drum machine user's manual.
Nothing, not a thing in Akai's archives. Same luck with the service
manual/schematics.

The story: a guy bought it and thought it was broken and bring it to
me to "fix it up". As far I can tell, everything is ok... besides
noisy outputs (not a problem. I know the cure). I rapidely tested its
electronics and no major problems detected. But working without
manuals and schematics is not the ideal for me. The patches are weird
as hell and the originals are more than a necessity.

And one question: is there a way to retore the factory presets? Is
there a file available and a procedure available somewhere? It's kind
of urgent: someone is waiting for his XR10. 

Thanks in advance