Mute connection on Ford RDS 6006e?

I am connecting a bluetooth handfree kit to my wife's Focus which has an RDS 6006e stereo. thee doesn't seem to be a terminal for the mute wire - is there not one or could it be one of the unwired terminal connectors?

We gave up on the CD changer ages ago - it was replaced under the original warranty, still jams and is too expensive to have fixed by Ford. I don't suppose the changer is available at a more modest cost to change myself? Thanks

Tony