Yeah, it is triggered by some situation with control of the RDU, not usually by the PTU itself. Since many people have PTUs that had been gunked down to basically solid gunk, and the AWD still worked fine, I am not sure that having only 10 oz in there was the cause of the AWD OFF message. I think all should be well now tho. As I said before, the ony other item you can check is the electrical integrity of the connection at the ATC.