Might want to try switching the amps left to right and seeing if the same amp gets hot (problem with the amp) or the same channel gets hot (problem somewhere else).
One SS amp running hotter that the other,. . .
should I be concerned? I have a pair of Classe CA301's that I bought at seperate times. I'm not running them in bridged mode. One seems to be quite a bit hotter than the other. Hot enough that you can't leave your hand on it for more than a few seconds. The other one is just very warm although not enough that you feel you have to pull your hand away.