Parasound 1500A amp extremely hot even at idle?

Hello Parasound owners - I'd really appreciate your feedback. I own a Parasound 1500A two channel amp that I use with a Parasound PLD-2000 pre-amp. I love the combination, but the 1500A amp becomes extremely hot on the top and sides - so hot that you can't keep your hand on it. The heat occurs even if the amp is powered up without driving music. I have the 1500A is an open space so it's getting plenty of ventilation.

I've owned other Parasound two-channel amps (1200 II, 1000A) in the past and they all got warm, but never hot or extremely hot, even when pushing them hard. I wanted to ask if any of you have experienced this same extreme heat with your Parasound 1500A?

Thanks in advance for your feedback - as usual your expertise is invaluable.

Matt