I have now obtained a manual for the Brunswick/Briarwood "Aspen" home pinball machine. I have scanned and digitally cleaned up the general machine schematic and it's posted here:
http://www.arcade-museum.com/manuals-pinball/A/Aspen%20general%20schematic.pdf
http://www.arcade-museum.com/manuals-pinball/A/Aspen%20switch%20matrix.pdf