I have a SII in my A3 - recently obtained through a mate who was upgrading. When I connect it it says there is a CD ERROR. No CDs in the unit and I managed to remove the top plate which reveals a small piece of injection moulded white plastic about 1cm square lying loose by the CD selection mechanism. Cannot see where where it might have come from - it has two small posts on it to indicate it is a hinged part. Anyone taken their SII apart and might recognise it if I sent a pic via a PM? Thanks.