Volvo L90E Shift solenoid

Shift solenoid error msg keeps popping up on the screen. Machine will not go back or forward when this happens. I have marked and unplugged the six solenoids off of the side of the trans. They seem to be more of "what gear its in" and not just a foreward and reverse selector. Should I be looking more towards the for/rev switch or is there actually just another solenoid located elsewhere? Thanks

Volvo L90E Shift solenoid