Timing chain tensioner can be pricey, they probably need to replace it with a newer revision as the older ones are terrible, id expect about half that quote is just for that.
Could be worth while finding a VW specialist over the dealership too. On the Gold Coast the quotes i got were WAY higher through VW whereas VA Garage specialists were significantly cheaper and knew all common problems by heart. So took any guess work out and lowers labour costs.
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