My 2008 ML320CDI has an intermittent shifter problem. When I press the park button it randomly works. I could change the shifter but would like to use a multi-meter to test the switch. I have searched under the dash to locate and trace the wiring to a connection. I know intermittent problems can be quite costly with the dealer shot gunning with computer modules. Could someone with Star Tekinfo access locate a connection point or procedure to test the switch? Thank you. Scott