5-6 years ago I was stuck out in Washington state where my coach would not move. It was an Allison 6 speed in my Airstream dp. I was towed to a local shop where they could not diagnose the problem. At that point We were looking at a few thousand dollars to replace the ecu. Someone on RV net sent me the name of a man that lives in PA. he speaks broken English (German I think) he is a wizard with the ecu and controllers for the transmissions he diagnosed the problem over the phone and I sent him the ecu. He had it back to me in 2 days all ready to go. I hope someone on the forum will read this and post a name or send a PM to the OP concerning his name and contact info. It was a huge savings to me as I think my total came to about $500.00