I have a 2011 3.0TDI with way more miles and none of the items you mentioned have worn out.
I did have a coolant leak on the pipework in the vee of the engine close to the injector pump. It turned out to be a very big job and i hope you aren’t as unfortunate.
Injector pump was leaking diesel causing seals/pipework on the coolant lines to leak coolant in the vee of the engine. No signs of any leaks on the driveway as both fluids evaporated with the heat from the engine.
Several weeks later, engine out job, new injector pump and all coolant pipework fittings replaced in the vicinity etc.
Work carried out by a main dealer, audi covered all the parts and car hire but I had to pay half the labour which was still a hefty bill.
Service manager advised that they had done a few similar warranty jobs on newer A7’s and an Allroad with the same 3.0TDI engine.
Hope you have better luck with yours.
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