For the last day or three the Roadster has been making a new noise after shutdown. Takes a minute to a minute and a half after turn off to start, it slowly rises in volume and then stops. I'd call it a cyclic ping, cooing, or chirp sound. The sound is definitely louder in person, but not significantly. The first time I didn't realize it was the car. Doesn't seem to depend on how long the car is on/distance. Coolant levels are good, pump is running normally, nothing seems out of whack in the rear end. Car is driving and running fine, no warnings in diagnostic mode (should dump the logs and check them). Doesn't seem to happen when the car is running, but there is enough other noise that it would be hard to tell. The car was at Tesla for its yearly only 2 months ago. My best guess is a cooling fan bearing beginning to fail -- I hope I'm wrong, also it doesn't seem like the fans are really spinning when I hear it. Anyone had similar symptoms or have any thoughts? Thanks!