Clarion ARB0170E Aux modification?

Has anyone modified the standard Clarion cassette radio which came with the Mark 1 MX5, model number ARB0170E to add an Aux input? I have taken the lid off it and there is a rainbow ribbon connector coming from the on/off/volume potentiometer with six wires going to the connector on the back of the unit, and I suspect three of those wires are probably left and right channel inputs and ground. But I don’t really have the equipment to work out which…

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