Help repair PPI 5440

[mandude]

I originally made a post about my amp many months ago:

Amp repair shops in Phx AZ?

I am now ready to repair it.

To highlight what the problem is:

Channels 3 and 4 died first. Then, quite some time after, the sub channel died. Then, shortly after that, channels 1 and 2 died. I always ran the amp fairly hard, and it is extremely hot here in the summer, so I'm sure that didn't help.

What I mean by died, is that the output started to sound kind of crackly, then after a few days/weeks pretty much no output. At that point, any sound that there was was extremely crackly sounding.

Please help me know where to start looking...ampguts does have pictures if you want to use that to help me:

http://ampguts.realmofexcursion.com/PPI_5440/

Thanks in advance!!!