Q7 Slow starting

PhilQ7

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Dear forum members
Can anybody help please?
I have a 2007 Q7 3.0 TDI, 146,000 miles. Owned from new and running great except for starting. 9 times out of 10 it takes 5 to 10 seconds to start in the morning. It is garaged overnight. it always starts first time and once started will typically, but not always, start normally the 2nd time.
It has had a new battery and new inlet manifolds.
Audi has had the car in on 2 occasions to investigate and say that no fault is logged and it starts ok for them.
Has anybody experienced anything similar and could offer some advice
Thanks
Phil
 
starter motor. Guaranteed.
for some reason this doesn't log a fault and when its warm it fires up first time.

hope that helps