aidi a6 :- whining noise

hi all, hopefully someone will have an idea what this problem is. i have an 1999 audi a6 2.5 tdi saloon. and all of a sudden its started sounding like a sack of spanners. there is this whistling hissing kinda noise especially when the clutch is depressed, the turbo i think is working fine and this was new 14 months ago. now we did have some serious flooding were i live in hull but was very careful i did not get water in the car. the car drives the same as normal as not lost any power and had a full service 8 months ago if any one as any ideas i would be very grateful thanks stef

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Stef
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