If you need to pay somebody else to do it, I am not sure it makes sense to clean and regrease. If it does not help, you will have to pay for work again. Parts are not that expensive compared to labour. If you have a lot of free time and don't mind getting your hands dirty then may be worth a go.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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