Hi Dave_P,
THe only other resource that might be helpful is the Customer tips website. On this site there are several PDL reference guides that contain the PCL escape commands for the resident fonts. I am not sure it will help but here is the link to the PDL reference guide for the Xerox Color 560 maybe this will lead you in the right direction. There are other resource material listed in the document. If this does not help please consider contacting your support centre for further assistance.