DENON AVR-2800 No sound No audio Power on

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I have one denon amp that I am trying to repair. It was working fine suddenly it stopped. No more sound. Once in a while comes on , if the receiver is on for sometimes. I am not sure what to change. I guess it is in output stage. Do I have to change the output transistor or it just some kind of relay?

when I turn the receiver on, the power/standby light blinks 7 or 8 times and ralay clicks. But no sound. Please give some input so that I can fix the amp. I am really into it. Any help would be appreciated.
 
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