My 70 MC came with the power door lock option. However, the locks do not open/close using the switch on the driver's side. They both open/close using the switch from the passengers side. Because the solenoids both work but only from the passenger's side, I am assuming the drivers side switch is bad. I took the switch off to bench test it with an tester that has the black and red leads and that you can test ohms, volts, etc. The back of the switch has two prongs that I connected the back and red leads to and then pressed the switch to see if the needle moved. It did not. Attaching the leads to the wire from the doors shows current (the needle moved). Can the switch be bad? Any use in taking the switch apart and trying to clean/repair it? Am I on the right track?