Sony DPS-M7 problems

[Brinxter]

Hi guys

Does anyone have any ideas what could be wrong with my Sony dps-m7?
So the unit is missing one of the two outputs on all presets except the last 4 of 100
I have checked all clocking signals, all voltages.
Only strange voltage I have found is from one of the DSP´s to the DAC (DSPOUT) which is about half the supposed voltage, It still has data on it.

 

[Khron]

R501 went high-resistance?

 

[Brinxter]

R501 went high-resistance?

Nope

 

[Khron]

Any possibility to lift the respective pin of IC305? To see if that's dragging down the amplitude of the signal, or whether that's the way it comes out of IC517.