CSAS1

I have a 2013 ES 350 that has about 20k miles. When I was driving it earlier this week, it seemed to start slipping out of gear around 35 mph and then get back into gear as the rpms went down. As I went higher in speed, when pushing on the gas pedal, it didn't seem to accelerate the car. I called the service dept at my dealership and they told me to bring it right in. Next morning they called and said they got a "code" indicating a potential issue with the transmission but wouldn't know until they took the "plate" off and inspected for shavings. Said he had to make a report to Lexus. Today he called and told me my whole transmission was going to be replaced. Then he told me that there were none to be found in the US. I now have to wait until one could be shipped from Japan. I was happy at the quick attention to the issue, but shocked that my NEW car, less than a year old, needs a new transmission.