I believe the advice is to change the belt and tensioner at 54K? It's the tensioner that actually fails, taking out the aux belt (and sometimes the cam belt too).
As a side note, has anyone heard of tensioner issues when an aftermarket one is fitted? I have a Gates one fitted (and have gone beyond the 54km interval so needs replacing) and am tempted to replace with the same, given the Volvo one's track record.
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