After running the car a while, and driving it a bit more (it's not road legal, so I'm staying in the neighbourhood) a few things popped up that I haven't seen until today. The adaptive headlights warning came on, accompanied by a flashing green light on the headlamp switch. Additionally, the fog lights do not illuminate, despite the green indicator showing up on the dash, and the fact that I tried them back when the vehicle didn't run, and they worked. Also a warning about sunroof entrapment.
After another scan with ISTA I now see a few new fault codes.

002C9D DME: Oxygen sensor heating before catalytic converer 2, activation
002F71 DME: Electronics-box fan, activation
00601D and 00601E EMF: DSC interface: Signal invalid

Also it's showing the PDC module now as red in the control unit tree. and it's giving me a code S 0158 for no communication with the Park Distance Control, but the PDC system is working perfectly fine on the display and operates perfectly fine.

Also, after another attempt to calibrate the transfer case servo, I got as far as identifying the resistor. (it was a single character; can't remember if it was a letter or a number) and the VTC coding faults are gone, but it still wouldn't let me calibrate the servo, because it said it couldn't calibrate it "fault-free"

I'm going to get into the FRM and JBE and see what condition the connectors are in. I think the FRM might be a bit easier to get out. The JBE swings down but there's some kind of hinge with tabs that might take a person with 3 arms to extricate.
I still haven't solved the always on ambiance lights in the overhead console, so I'm hoping some reseating of the connectors will help with a few things.