I had that fault rectified on my 11 month old S80 this week, they diagnosed it as a faulty module in the end, the fault started as 'on call service required' then after 3 weeks went onto 'on call service de-activated'.
The funny thing is, the message first started appearing only on cold sub zero days not on plus zero ones.
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Had 1981 265 GLE V6
Had 2003 S60 20T SE
Had 2008 S80 D5 LUX  Too many electrical problems
Last 2009 Merc CLS
Now 2004 S80 2.5T SE + Freelander! (BOGOF!)
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