Hi,
Ive had problems 1st to 2nd gear, stiff changing and clonking as descibed before. My car is 2007- 9500 miles. They stripped it down and ordered loads of parts, they found gearing worn, it is covered under warranty deffinately, you can use my reg for reference if you call nissan customer services, thats if your dealer gets funny, best to report to customer services anyway, that way it is on record. My reg is C6 TEE, Regards Richard