Fault
Left channel Audio very low and could hardly be heard right channel working fine.

1 KHz test signal injected and scope used to check the signal level entering and exiting the volume control potentiometer.

No signal on the wiper of the left channel wafer.

Replacement dual 100KA D Shaft Potentiometer fitted, also speaker protection relay 24V DP/CO replaced.

User controls and switches cleaned with Servisol super 10.

Amplifier fully tested correct operation

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