Measure the DC voltage (if any) between the individual heat-sinks; while operating, but open, with additional external desktop fan providing additional cooling.
I'll try to accommodate this. Unit wasn't friendly with me when I had the fans disconnected or even connected, will try a workaround.
Thanks in advance. If you can't do this with the unit open then just measure the voltages on those heatsinks that can be reached through the case openings with the case closed and just the fans temporarily moved aside.