Derek, if I had to make a guess, I would say that the previous owner did a DIY installation of the "8720DU Opt. 000 Peformance Update Kit". That would explain many of the problems you are seeing (pinched cable, heat sink, missing options in the firmware, and maybe more). Do a web search for document no. 08720-90372. This describes the conversion to the new CPU board and data entry into the EEPROM.
Vladan
