Marantz SR 810

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Hi everyone, I am new here and already in with a question. I have a Marantz SR 810 which I bought some time ago and when I bought it only had one channel working. I was going to take a look at it on the weekend and now it won't even power up.

There is an area on the circuitboard that seems to have sustained damage. IN particular there is a diode that has been completely destroyed so I have no idea what to replace it with.

Does anybody by any change have a schematic for this model. I have not been able to find any in the usual places after extensive searching.

Thanks in advance.

Edit:
Here is a pic of the inside. Diode is pointed out with yellow arrow
An externally hosted image should be here but it was not working when we last tested it.
 
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