Goldmund GM27 clone

Hi
I have just bought a Goldmund GM27 clone working on one channel only.
Does anyone know this specific PCB?
I cannot find any schematics for it, although I have plenty for other variants of this amp.

What I was curious about was the two power input sections at the bottom of the PCB. Why is only one of them connected? Is it just an alternative input?

Thanks for any help!

:) morten
 

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