hifi engine

Marantz 1515 full schematic or interconnection info needed

I have gone through the service manual dozens of times now and if I haven't already lost my mind I'm about to. I can't find any documentation anywhere regarding the wire wrapped connections between the circuit boards in this receiver. I can't believe the service manual doesn't include this info or a comprehensive schematic.
Does anyone have any ideas on where I can dig up the interconnect info?