Unplug the VVT control solenoid and see if the noise goes away. If it does, the VVT phaser is shot.I had an in-depth chat with a VW master tech about noises from under the chain cover, in spite of changing the chain, and he said "Yep, it's why we replace the whole lot and not just the chain/tensioner"https://www.akstuning.co.uk/shop/home/538-genuine-tfsi-vvt-repair-kit-06f198088d.html
It's the mega money sprocket bolted to the exhaust cam mate. The little b1tch of a bolt that always rounds out when removing it
I will be fitting these to mine when I get the cover & head back:https://www.ebay.co.uk/itm/333932651192I tried removing the old ones as practice, gently splitting the ring and winging the end over the lip - top one came off, other 2 snapped very easily - I understand they get brittle with age, the new ones feel a lot more flexible.