I had a piece of metal get stuck in mine at just over 1000 miles. The Run-flats work fine (40 mile trip at zero pressure)! Anyway, the dealer fixed it. $100; the tire had to come off the rim and be re-mounted, and balance checked.
They also told me that there was some momentary trouble clearing the code, but they got it straightened out...mostly due to the infrequency of GT-R tire repair at the dealership, and their unfamiliarity with clearing tire-codes.
No problem since...no leakage. They did suggest I don't run top speed though.
Alexd