When we had this exact same issue with the same unit in our S70 we simply tracked down a decent SC805 unit. It's a straight swap.
Since then I've repaired the SC805 several times - the one currently in the car is actually made up of bits from three different 805 units.
Unless you really need the 3-CD changer then personally I'd get on to Ebay and look for a decent SC800 series unit, ideally with the code and a warranty.
Jack
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