I got the service ticket from the guy who had it looked at before me. Here is what the yale dealer ticket says. "4/15/13 Drove to location, located unit and troubleshot. Found code 524224-3" Then below that it says, "4/16/13 drove back to location installed used pressure transducer. No codes, only has forward. Checked reverse- no pressure to clutch packs. Needs trans rebuild"