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NAD 7020 tuner-amp. Circuit schematic required.

Hello, I should appreciate help from anyone who is familiar with the NAD 7020 tuner-amp. I am trying to get a copy of a circuit schematic diagram to locate a power supply fault.
I have already searched the web, but the only diagram I am able to locate is headed '7020N'. The problem is that component values and designations in this diagram are different to the ones I am looking at in the amp. itself.
The amp serial number is A7224991 & the main pcb is labelled 'Amarilla 394V-1', as is the plug-in power daughter board.