yes,after the warranty ran out,I took the top off the 876 and installed some PC cooling fans with their own power supply,they work great and are nice & quiet,I will also say the unit has good air flow around it too.
this unit has been used daily from 4 or more hours a day.
the HDMI board ? they did'nt really say a reason,
and IMO Onkyo CS was good,but the CS at the auth service center was fantastic !
fortunetly I live close enough to drive to the onkyo ASC,so I did,and they paid for shipping back to me.
and I'm can't answer the 702/pre-pro question,
I will say again though,since the board replacement,my 876 has runs flawlessly and yes,I love all the features.