My 08 RR HSE with 90k miles is giving me a transmission overheat message along with select neutral and then it automatically goes into sport mode. The RR doesn't leak anything and had it hooked up while driving to check temps. Everything is running as it should and all temps are normal as well as shifting normal. My only guess would be a transmission temp sensor. But where would that be? I have already shelled out $$$ at two garages and both couldn't help.