@bigkidz You state that the only time one needs a schematic is when the part (pat sic) values are not marked. While this is correct, that occurrence is more than common, particularly it would seem on most typical high end gear. IMO, the more boutique the manufacturer, the more likely this was a factor.
I have discussed this with several techs that I know, they think that without a schematic and/or with knowledge of the part value, the piece basically becomes a boat anchor! To that, as a member stated above, some parts are more than ’unusual’ ( ala the ghost display of the new ARC amps). If that fails, and no one has a source for parts..same result...boat anchor. Hopefully before closing their doors for good ( which I hope they do NOT have to do), someone at the factory will have the decency to let the schematics go public and also the other parts supply vendors.