Rhodes Chroma Polaris

Hello CPs!

I've still no luch with my polaris.

I've completely redone the power supply, Voltages are correct and
precise. And I started againg and again resettingg everything, but
voices are missing.
But the click and honk too are missing.

I tried to measure variation in voltages arriving to the Voices. But
the voltages are unchanged for any operation in the panel.

If for example I change the volume, I can't see a volume change in pin
7 of teh ZX03 IC

But I see variation entering in the ADC (from the 374).

I'm suspecting, at this point a blown DAC:

A)
What I can do to be sure that DAC is working (or not working) ?

B) 
Do you know of any DAC HS3140C reseller ?

thank you for your time

AT