I forgot that I have a PDF copy of a Service Manual for the KN7000
Having had a look through it, there are 11 references on page 50, to "FAN BAG" - whatever they are - but as Bob says, no direct reference to an actual fan.
My KN7000 has been switched on for about 2 1/2 hours now and the warmest part I find, is not directly above the power transformer. If you close the 'lid', you will see 5 white rectangular rubber stops along the middle part of the upper surface. The warmest part I find, and it is only slightly warm, is mid-way between the second and third rubber stop, from the left end of the cabinet. The Manual indicates that directly under this area, is a printed circuit board which contains all the Power Supply Regulators and the Power Amplifiers, which drive the internal speakers. This being the case, I would expect that area to be a little warm, but certainly not too hot to touch