I know for a fact that continued operation at 230 is bad. That's with the temp sensor in the side port
On my way to BTS, it was running 120 over ambient in 110 weather. The fluid that was brand new a month ago (200-300 miles before the trip) was completely burnt and almost black. When I told Brian what it had been running and he saw the inside of the transmission, he was amazed I had made it.