I'm also having this issue. I've just checked both tail lamp assemblies, they're in perfect condition (btw, if the corrosion is bad, as pictured in the service bulletin, you can probably see through the lens without removing the assembly).
This began on my parents car while they were driving and after I drove around for a bit, seemed to correct itself. The symptom was present 100% of the time initially, when the throttle was opened, the engine would only rev to about 1800 RPM (even at WOT) and the car would only move slowly (about 10-20 km/h). I had accidentally opened the trunk (probably pressed the button with the keys in my pocket, either that, or my parents had been driving around with it open, which I doubt). And decided to check the reverse lights. I turned the ignition to run and put the parking brake on, then placed the gear selector in reverse. When I went outside to check the reverse lights, they were off (at least the left one was), and when I closed the trunk, they turned back on. I'm assuming some faulty connection was jarred back into contact.
At this point I went out for a drive, the problem was still present, but quickly disappeared. The car functioned normally for the rest of the second test drive, and didn't duplicate the problem.
I also noticed there was a smell of burning electrical insulation, I think it was after I closed the trunk, but I can't be sure. It was definitely after my first test drive. I don't think it was the OBD module, but I suppose it could've been. My concerns are now that the problem lies in a harness somewhere, the gear selector and associated switches or the TRS itself. I'm hoping it's not the TRS or the CVT. I'm also wondering if it has to do with the CVT temperature, because the behaviour would fit that situation also.
Can anyone suggest my next troubleshooting step? I'm going to check the resistance of the circuits in the tail lamp assemblies before I re-install them, but I'm not expecting to find anything. After that, I guess I'll go for another test drive and see what it does. Thanks in advance for any help!
Edit: I forgot to mention, both the TCM and ECM have set code P0705.
Update: I went for another test drive this morning, it was colder than the last test drive I took. The car behaved flawlessly. My current theory is that this is an electrical fault in the reverse lamp wiring (which may explain the non-functioning reverse lamps when the trunk was open). It could even have been a bad ground on the tail lamp assemblies. At this point I'm going to have to wait and see if the problem returns/gets worse.