Volvo Ishift problem

I have a 2105 Volvo with a D13 and Ishift transmissions. It has never given me any issues with slipping, vibration, or really any symptoms of transmission or clutch issues. Then suddenly I parked at the truck stop for the night and the next day when I went to leave I put the truck in reverse and nothing. It shows R1 on display but it does not engage and when you push the accelerator while in gear it does not respond. I do not have a check transmission warning but I do have one code. SA 24 DTC P107694 which I looked it up said gear bock brake unexpected operation. I have disconnected all power for 20 minutes and had Loves attempt to clear codes neither thing helped. Code is also intermittent.

 

All three tanks have air in them. That was my first thought that was probably air related but I have not found any air leaks either. Thank you for the suggestion though.