PROBLEM: '92 Hurco BMC20, ser.# ZA9001072J. Tool changer removed tool fine, but when trying to put another tool in spindle changer, it did not go down first. Instead, it went horizontally much faster than usual. Suspect that a solenoid may be stuck. I disassembled the air system, cleaning the manifold, valves & solenoids. I color coded all lines & solenoids to reasseble properly. Still no change. Also, when going to diagnostics (F7) the soft keys do not respond. With machine off & plugging in air, changer should always go up, instead it moves right to spindle. Please Help!