UBitx 6 Tuning Knob does nothing


I have just assembled my uBit 6 and applied power. It starts up fine and the touch screen works as it should. However, when I turn the tuning knob the frequency does not change and it goes from received audio to high pitched whistle. The tone and volume change if I turn the volume knob.

I have checked the connections and all appear OK. Any suggestions as to the cause?s

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