What a saga. The strange humming noise from the rear I first heard a year and a half ago, which gradually turned into a worrying drone, and which could for so long not be diagnosed, turned out to be two things in the end - both of them components of the 'rear differential'. A worn-out electro-hydraulic power-distributor (the Haldex), which had been making most of the noise, and a dodgy bearing in
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