I think it’s probably time for people to start posting audio clips of what they’re talking about.
What I *think* people are talking about only happens the moment that the instrument cluster lights up after the truck has been asleep (indicating that the bus is now awake).
I’ll get a video of this happening tomorrow or Friday, but I would describe the sound as the thud you would hear when you put the needle on a record at low volume, and the ensuing, very brief, hiss. It’s not very loud at all, and if you’re not paying attention for it, you probably wouldn’t even notice it.