I need help for a Unimog 435 U1300l We have a 8 speed transmission with air shift for low and high range . Transmission is stuck in High range. Im in Nicaragua on mission repairing equipment. Please email me an AIR SYSTEM DIAGRAM for this truck if possible. I think this is a 717.901 unit but not sure. If I could get the air diagram it would help greatly. My VIN# is WDB4351151W131565 MODEL 435.115 My name is Joe Vause. Please email to: n2diesel@msn.com Thank you, In Christ alone,jv.