I'm not sure where this temperature number came from, it wasn't me - I only referenced ambient air temp that day at 12C or 54F. Don't have a temp gauge for the belt case and don't see me putting one in. Interesting to see what temps in there maybe, but I was just putting along all day and then a couple minutes at higher speed, not matted to the floor.
No smoking gun yet but haven't even looked at the ducting yet as Budro2 had suggested. I'm at work and just sneaking in this teardown during breaks.