If anyone is interested in cooling the panel, and doesn't have access to an infrared camera (and boy, are they expensive, even to rent!), you could try what I tried.
Cole Parmer carries 25-packs of little thermal strips: "Reusable 7-Point Horizontal Adhesive Temperature Label, 86-140F; 25/Pk EW-90308-30".
You stick these on the back in columns in the areas known to be hot, and can see the heat map directly just by looking at the back of the panel.
My system? Google for: Martin Logan 420 CLX Descent Stage Summit