Let's re-focus;
Firstly let's use channel 1; Set the input to Ground, that means the input is shorted to Ground.
Adjust those center potentiometer so that the 2 voltages are about same.
Can you achieve it?
Edit: Also R145 Ch1 Gain potentiometer.
Edit: Set the Balance to Centre R107.
ok, grounded the input, centered R107, centered R123, maxed R145 and I got the 1.74V reading raised to 2.07V and 2.32V reading raised to 2.72V
I tried to fiddle around with the pots but couldn´t get them closer.
Also measured Q203 and Q202 emiters to ground and they read 2.04V
Checked continuity from both transistors to the nearer resistors all check ok.
checked the resistors in circuit and they read:
R204: 82.6 ohm
R202: 413
R203: 413
R207: 268.4
R206: 268.4
R218: 121.8
R219: 122.1
R216: 335.9
R217: 334.8
R142: 91.2
R143: 90
Thanks a bunch