Take it to the dealer.
Here is the link that talks about it all.
CSC failure covered under warranty?
This is from MrAurora that posted this:
Update for those interested or experiancing this same issue:
I called Nissan consumer affairs (the number listed in the warranty booklet) and had them pull up the book and read the powertrain section on the phone with me. We had same book which was a pleasant surprise ! Was expecting an different version with exclusions in it but i digress... The powertrain section says "all internal parts except those listed in the not covered section" under transmission coverage. He read the not covered section aloud and it says NOTHING about excluding the slave and that it's covered. He gave me a case number and contact info. I then called the dealer and the gods were kind to me. The Bob-inator was on vacation and i was transferred to a woman who knew her stuff. To make a long story short, she thinks its in the nissan computer wrong because the slave in our cars is not dedicated, its integrated with the throwout bearing and therefor part of the powertrain and should be covered. So as of right now i am scheduled to have the work done under the powertrain warranty on thursday.
If you’re out of the 36k or 3 year warranty you should be fine. Its covered under the power train warranty which is 5 years or 60k like JARblue said (hopefully your under that).