My KN7000 has been getting warm in back of the lid for several years. My tech told me it apparently is not hurting anything, and to turn it off during breaks, if I wanted to. I have never bothered to do that.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact