warning lights showing A.B.S. traction control and decend control have all come on for second time. main dealer said common glitch but plugged into their computer which said possible 'shuttle valve switch' fault. dealer stated adjusted switch and reset lights which stayed off for four days. I have been told that the switch on the gear lever (decend control) is the shuttle valve switch, is this correct? On investigation i found that both wires were off the switch and also the socket that fits on gear lever was nowhere to be seen(plug intact though) switch and socket both replaced, but as switch is normally open is this the only reason for the warning showing?????? any info please before i payout again to have warning lights switched off by dealer again