Did you ever notice that door with the frame shifting before all this? Like any gaps at the top or weird light coming through?

Yeah @hill.troy, once you see that first payout it really changes your perspective on gating!

Grab a magnetic vent mount and hold it up to the back of your phone without actually sticking it on, if the magnets feel strong when they're a few millimeters away then that's too much pull for the OIS. Honestly I fried a Pixel 7 camera the same way, the magnetic field messes with the tiny coil that moves the lens to stabilize your shots. Stick with a good grip case or a clip-on mount that doesn't rely on magnets if you want to save your camera.

Man, it's just a book... not everything needs a therapist's couch.

I'm with you 100% on that, "bad call in St. Louis" part really hits home. I had a similar nightmare last year where the factory diagram was completely outdated and had me chasing a phantom ground for two hours before I just started poking around the harness myself. Nothing beats actually seeing the wires and using your meter to figure out what's what, especially in older buildings where the prints are just a suggestion at best.