customer just bought vehicle and brought it in with this complaint also no lockup. we first watched solenoids with LED and noticed sol. stays engaged even when we loose OD. Flushed cooler and found lining. After Rebuild including solenoids and relacing plugs behind shift valves, we still have same complaint. Pressure on forward tap shows OD falling out when pressure goes under 105psi. We also still have no lockup unless we apply current to solenoid. Any help would be appreciated