I have had a few intermittent problems with my lift and tilt functions locking up at random times. The BICS Control Valve light flashes three times (grounded circuit) when this occurs. I have been completely through the wiring harnesses. I am now thinking the control vavle sensor is the next likely culprit. But where/what does the BICS monitor for the control vavle circuit. Is this the Hydraulic Lock Solenoid? If I key off the tractor and restart the error resets. The BICS was randomly locking up both the control vavle and the traction lock. With two separate errors I suspected a chaffing of the wiring harness. I went through every inch and the wire is in great shape. After some reading on a couple of forums I replaced the traction lock solenoid. That seemed to fix that part of the problem - although my testing only involved driving it across the parking area. The old traction lock solenoid measured 0.35 ohms and 12.3 ohms - just outside recomendations. The new solenoid measured 0.37 ohms and 11.2 ohms. Still just outside but closer to spec... I measured the hydraulic lock solenoid but it has been a week and I do not recall the numbers. I recall that it measured within tolerance. Any other suggestions to look for on the control vavle error? Thanks in advance for your help. -dch