The Ref 6 manual is here
http://www.audioresearch.com/ContentsFiles/Ref6%20Manual%20WEB.pdf
As to working with VTL they much prefer that you go through a dealer. I suggest building a relationship with a good VTL dealer such as Brian Berdan at Audio Element in Pasadena. Most manufacturers prefer you work through a dealer and this way you should have no problems having your used products supported. The real party at fault in your case is the dealer who sold you the demo. He or she should be helping you