Marantz PM-50 Amp

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I have this Marantz PM-50 which I have some trouble with. At the right channel it is all grounded but I can not seem to find the source of that. I have no schematocs so if some one have a schematic and would Email it to me I would be happy.

I have takken the output pins from the Amp and soldered them out but the right channel is still grounded.

Hope some one has an idea.
 
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