Here's some light reading for you:
http://www.danalee.ca/ttt/switching_...eo_effects.htm
Not factory manuals, but the main concept of signal flow and image manipulation look to be there.
There was a Spanish language manual for an earlier model on out-of-country ebay -- probably too many hurdles...
Also check out the various YouTube vids containing Grass Valley. Might be covered in a production system overview vid.
Chip