I'm troubleshooting an intermittent issue with my E 47. Occasionally when I try to raise or angle the blade to the right, it angles left. I replaced the "A" Valve and Crossover Relief, and rebuilt the "B" and "C" Valves last summer... From looking at the flow diagrams in the service manual could something have failed with the "B" check valve? Earlier today I took the "B" coil off and pushed up, or right, on the controller and the blade angled left. Anyone have any ideas?