Does anyone have explicit instructions on how to lower the temperature of the LTZ1000 for better stability; e.g., what resistors to change and to what value? Similarly, step-by-step instructions on how to back up the cal ram in the HP-3458A? I now Mark Sims posted his program on Jon Miles site but I am confused how to use it (I want to back up my HP-3458A before I attempt to replace the display board). thanks, Randy Evans AE6YG