Hello I've recently purchased a 1979 620 in rather dismal shape. I am going to need a lot of help to bring it back to life. My question to you folks is about door lock actuation. the locks on my truck will not engage. I've taken the panels off and reconnected the door handle rod that had fallen off. The lock rods are still connected but won't go up and down. Common issue? idea for fixes? I found this board through Google and it has been very helpful so far.Thank you.