IMO - This is a known problem in the Z34 and it is documented and has been reported several times over. You shouldn't need to pay a dime for them to be replaced since it was some sort of manufacturing defect.
FYI - I have had zero issues since having my replaced about a year and half ago and I've put about 25k miles on it since then (I think). Which, if I recall correctly, is more miles than when I first started noticing issues when she was brand new.
Any how, good luck getting things figured out. I personally know how much of a PITA this whole ordeal can be and I really hope your extended warranty will cover the parts if Nissan won't cover it as a known defect.
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-Chris
'13 Z34 Touring Sport | ARK GRiP CBE | Stillen G3 CAI | AAM HFC | UpRev | 20mm Z1 Spacers | StopTech Drilled/Slotted Rotors | StopTech SS Lines
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