Heated Underbelly 3950?

PUG

Pug
I live in Idaho and it can get a bit cold. My 3950 is suppossed to have a heated underbelly. I have had some of the black covering off underneath and see no ducting for heating of the underbelly. I have also noticed several holes in the frame etc. and gaps in the black undercover that could leak a lot of cold air. How is the underbelly heated and what can I do to seal it better?
 
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