Add me to the list having gotten their clutch packs replaced. Mine is a 12/11 build, 9,500 miles. I took it in compliaining of clutch slippage while accelerating and they performed TSB 11-12-13 and did the replacement. Mine didn't shudder or grind much at all. Just poor shift quality.
I asked the service advisor if they found a fluid leak and he said no, it was just a defective clutch pack. He couldn't say how it was defective other than something about it wasn't releasing properly.
I still believe this is primarily a software issue, or at least the hardware issues are exacerbated by the software. My DCT was perfectly smooth until I had the 12B37 update done. So how was it smooth if the clutches were defective from the factory as the dealer basically said? I don't buy it.