I checked the flow through the couplers and the right side worked fine, but the left side only had pressure on one hose. As sitting in the seat/dual hydraulics. Took the valve housing off thinking I'd find a bad oring but nothing, first 4 digit I've worked on. I didn't remove the thermal valves yet, but did remove spools and plugs that are in line together. Tractor didn't labor at all on the dead hose. Then I removed all the oil I could and stood on the three point arms to see any leakage from the piston or servo. Servo seemed to have oil around it even after a good blowing with air and brake clean. So removed the servo to find the mating orings to be just fine. Might try air tomorrow to the piston to see if any leaks by, then disassemble servo to see if I can see anything. thanks chris