Hi Guys,
Anyone had any of the following

1) A slight rotational grating sound. This is intermittent and hard to trace. Only noticeable on tickover after a journey and then disappears after about 5/8 seconds before you can get the bonnet up and try to trace it although it is becoming more frequent. Clearly rotational and possibly a tensioner, pulley, alternator, water pump etc. Anyone had any of these components fail?

2) An unusual rythmic resonance / rattle from the exhaust - again when the engine is hot and ticking over. Anyone had exhaust vibration problems?

Audi accept these problems are there but cannot as yet trace them - despite two goes. The car is an 09 with only 14,000 miles on the clock and the problems have been there since almost new.
Any help or possibilities appreciated
Rob