Anything related to printer controllers not being Duet, RAMPS or Sanguinololu: microprocessors, motor and heater driver circuitry, gEDA/KiCAD issues, soldering tips, etc.
I was/am having the same problem with the D600 pro. Did you ever end up getting the source code? I currently am wanting up the chamber temperature from 70c to 90c as the actual in chamber temperature is closer to 60c.