Greetings New Hampshire! And welcome to VX.info.

I'd be interested to know the cause of the problem too if I were you, but personal curiousity aside, both of your problems would be solved if you did just take your VX back to the dealer who did your TOD work. If it was working properly before you took it in, but now it's not, the work was obviously not completed correctly so the dealership should be obligated to further diagnose and repair the problem. Problem one solved. If they are able to fix the current problem to get your TOD working properly and are willing to tell you what they had to do, your curiousity is resolved (problem two solved).

I'm just saying, if you start poking around on your own trying to get the problem fixed, and something happens resulting in the dealership being able to tell that their work has been "reworked" in some way, they would be well within their rights to tell you they are under no further obligation and you're back to square one....less $1.2k.