Hi Mac,
Good you have checked the proxys etc are clean and if your truck is turning into sideways mode then you have confirmed all is well there.
You mentioned the steering cylinder internal leaks. If the truck is going into side ways mode then the proxy and steer cylinders are all ok. If the front wheel are out of aligned when in front driving mode then follow the steering purge process (decal in cab)
You mentioned one of the wheels was turning in the wrong direction when in side ways mode. There is a valve that changes the flow of oil to the front right wheel motor when the truck is changed into sideways mode. You are most likley not getting power to this valve.
Here are a couple of video's that should help you better understand the system,
https://www.youtube.com/watch?v=2lafmP341KM
and specifically, https://www.youtube.com/watch?v=GsmXtkOKyc8&t=28s
If you need additional technical support. Plese go to www.combilift.com , scroll to the bottom and select "Technical support" Fill out the form and one of the technical team will contact you. This works worldwide, no log in is required and is free regardless of the truck age..

Hope this helps.
Richard