Originally Posted by markbvt
It's been well-established that the sound is the stepper motor, which actuates a lever that resets the idle. You can actually watch it in action if you know where to look
You're absolutely correct.
I pulled the tank back, on my 1050, today. Cycled the key, started the bike, and whatnot. The aforementioned SAI solenoid makes some noise, but, the stepper motor is definitely the "faxing" noise. What's weird is that it makes a bunch of racket, but, doesn't move the whole time it's sending. Mystery solved, again. I shall bow down to Mark.