Any Robertson Audio 4010 owners on Agon?

I've got one -love it It does run hot-dependant on what it's driving and how high its volume is. I can't be sure as its always been well behaved but Id get it checked it sounds too hot from my experience with my one. How hot are the heat sinks at the back? Even if it needs repairs its still great value for money. I've had mine for 30+ years and it still runs well. It used to drive my Linn Isobariks but now has now taken a backstage. What preamp are you using?

the 4010 does run physically hot, but if it has not been re-capped, it might be close to death. That would be a shame.

I Thank you both for your replies.
 
As I said in my post, the blue-lit on/off  switch is very hot, the top of the amp is not that bad. I am concern as to what is causing that switch to get so heated up?  
Secondly, how would you know it is time to change the caps, the amp sounds so good, you have to hear it for yourselves. None of the past amps sounded as good as this, that list includes, Adcom 555 II, McCormack DNA0.5, Levinson 431, Jeff Rowland 102.

 I am using an Advent 300 receiver as a preamp, and a pair of Gershman Acoustics X-1 speakers. 

No experience with your amp, but on a product that old, it likely has a bulb in the switch instead of an LED.  The bulb will generate heat.  Another possible factor is the switch circuit.  The switch might be wired to full current rather than a relay circuit.  That will also make the switch warm.

I too have a 4010. Presently in storage. Could be output stage bias drifting too high.