2011 F150 XLT

Okay, so over the weekend the screen for my backup camera quit working. Not blue, just not turning on at all. Also, the dimming doesn't work, and the compass doesn't show up in the dash anymore.

I grabbed this diagram (https://www.f150forum.com/members/pi...-connector.png) and started testing.

Pin 1 has acc pwr.
Pin 2 - I'll get back to this in a moment
Pin 4 - has ground
Pin 8/16 - Proper connectivity to the rear tailgate harness (although I think a problem here would have resulted in a blue screen anyway)
Pin 9 - has 12v when truck in reverse

Anyway, since everything had power, I assumed it was a broken mirror and took it in to Ford. They swapped the mirror, didn't change a thing.

So, my current theories:

1. Something is wrong with the pin 2 wire that goes to the SJB. I have a LOT of aftermarket stuff and wiring on my truck, so it's certainly likely that I pinched something somewhere.
2. Alternatively, perhaps there's another control for the camera (like a wire from the cluster to the sjb maybe as it controls on/off/zoom for the camera) that is shorted.
3. Or, it's the SJB and is going back to Ford again.

I'd like to rule out 1 and 2, as if I take it to Ford and it's one of those, it wouldn't be covered under warranty and I would be fixing it.

So here's my questions:
1. Where does the Pin 2 wire from the mirror harness end up? I'd like to jumper that.
2. What other wires (like, from the cluster maybe?) would control the camera that I should check as well?
3. Anything else I haven't thought of here?