Dunno why people get so excited about it really. My Parents 500 TA did it for the 3+ years we had it, but it never seemed to affect anything else so we never even bothered mentioning it to a dealer. Chances are it'd be wrongly diagnosed and something else would be messed-up in the process, so it's best just left alone. People hating a car because it makes this occasional noise is just OTT I reckon - it's not worth worrying about.