I know which ground you are referencing. It has multiple grounds coming together at one place. This is where I had the Power Commander grounded, but it was clean and secured when I removed the PC earlier this summer.I know we had the spot where we grounded our power Commanders, but somewhere near the rear of the airbox, isnt there a grounding point with several wires coming together?
I'm not sure code 39 is to be taken, literally, every time its displayed. If you google "Kawasaki code 39" people have solved the issue with new batteries. I believe it could be that the ecu lost communication because xxx happened, first.,....
You may be right about not taking the code 39 literally, but just to be certain I will perform the checks indicated in the service manual for this, and move on from there if I find nothing wrong. I did replace the battery a couple months ago but the issue remained.
I have the feeling that the root cause will be some minor issue, it's just that it is hiding very well.