Harman Kardon amp
 

I have a harman kardon pa2000 amp that has a very distorted and low level speaker output. I was wondering if anyone out there can point me in the right direction to get this amp back up and running. I am thinking it may be one or more of the power transistors, but I'm not sure. If any one has a service manual for this amp, I would be really happy if you could either post a link to it, or email it to me.

Thanks in advance,
Adam