I was repositioning my joey yesterday and noticed that it was very hot on top where it ventilates. I was so hot that I could keep my hand on it, but it was uncomfortable. Any hotter and that may not be the case. I went and checked my other joey for comparison purposes and it was pretty "warm", but not quite as hot as the first joey. Is this normal? Is there any temp checks in the diagnostic menu? If so, what should it be?