A Bosch specialist for a clean of all 8 is probably not a bad idea - at least it'll tell you if more than 1 is on the way out and whether they can be restored to as new.
I've had it done on a previous car and it made a massive difference
eta - if the forum sponsors don't have any on their own you could try brasiliangringo in case he has some spare?
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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