2012 35i fuel injector short circuit B+ codes

[Siggy]

I'm getting 2 codes, 2A00 and 2A14, injector cylinder 1 and cylinder 6 high voltage short circuit to B+ errors. I understand those two are triggered by the same thing in the ECU, if what I read is correct, so it really could be either, or both.

I found a technical bulletin from BMW that someone posted online that showed those codes and said it could be the power distribution box, the ECU, or the wires going to the injectors. I removed the power distribution box, cut it open and tested all fuses and they were all in tack so I assume that is working. I pulled the manifold and ECU out and shipped it off to be checked/repaired. They notified me they checked it and it functioned properly, no errors at all. The Technical Bulletin was very specific an in bold letters said "DO NOT REPLACE THE INJECTORS, IT IS NOT THEM" (paraphrasing).

I haven't checked all the individual wires going to the injectors yet, it's on my list of things to do, but that's next. I was hoping to find a schematic of the injectors so I could check the continuity of each injector wire going back to the plug but I haven't been able to locate that yet. So far, I haven't traced the injector wires to the plug yet so I'm not sure which plug I'm looking for to do that just yet. The ECU is still out of the car, I thought it might be easier to wring the wires out before I put the manifold back on.

Just checking in here to make sure I'm heading down the right path or if I'm completely in the wrong place. There appears to be very little about those codes online.

Any tips, suggestions, things to check?