Hi guys, did you ever figure this out?
Same symptoms as those mentioned above:
Constant ticking noise
Does not change in volume as volume is adjusted, but does stop when volume is reduced to zero
No change whether engine is running or not.
Here is a vid to show what I'm talking about:
https://youtu.be/J3s6IHbG5LY
It seems to be an issue with the rotary encoder or the ICC internal amplifier. Wondering if it's something user serviceable or not? I'm not afraid to pull the soldering iron out if needed.