Marantz PM-66SE KI Signature PSU Modifications

That picture appears to be correct.
Here's what I did...;
 

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My apologies... I should have stated that when using the connections shown in my previous picture the 'SOURCE Direct' switch must be out/disengaged.
If the 'SOURCE Direct' switch is in/engaged, the source signal is switched via the relay to a different set of connections (I can't remember which pins, but I believe they're DL & DR).

Good Luck!
 

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Hamish119,

Thank you very much to reply me. I confirmed I had messed up the wires in my previous attempt. With extra care, I successfully route the signal like what you did without going thru the source direct and need not to engage it either.

To further trace issue of left ch sound softer than right, I directing signal from input go straight to the main power PCB, bypassing the volume pot, I am happy to see DVM showed both ch output got same level of set AV. It likely the vol pot is the culprit.