They probably changed the cambelt & tensioner (which is what the service schedule says to change), but they haven't changed the idlers (these are not part of the schedule). The idlers were probably fine 28,000 miles ago but I reckon one will now have failed, allowing the belt to rub on the casing and wear out, or simply thrown the belt off, or an idler has seized and rubbed the belt through. Seen all 3 happen, the idlers seem to be the main cause of belt failure on the V6s we buy with snapped cambelts to break, and in my opinion a cambelt change on a V6 isn't done properly unless the idlers are changed. But unfortunately my opinion isn't what Alfa say to change in the service schedule, so they rarely get done. They are £44 + VAT each so do add a fair bit to the already expensive V6 cambelt job.
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