Made 2007
Although the pmp1000 uses 4580 opamps like the 1280, not the same in the
prea area.
The wipers of the level pots there are at ground, "low" and "high" via
Rs/Cs to opamp inputs.
The 1000 has stereo pots, the pairs of low-side, wipers or high-side are
not connected together, but similarly close connected to opamp inputs.
Without a SM this will be a pain. Next thing is check +/-rails for the
opamps.