Don't try to unhook the couplers, even if you can unhook them you well not get them back hooked. Just bleed it down to where you want it then drive to shop. 5 min job.
Well, it is all fixed now. One of the ball-headed plunger gizmos in the control joystick had come unscrewed from its cable; everything is tightened up now and working great, again.
Thanks for the suggestions.
Well that was an easy fix. Usually it is the screw up under the control lever that falls out and the joystick goes limpdick. It happened to me out of the blue. The screw sitting on the floorplan was a dead giveaway.