Time to fix it, of course, and I dread trying to splice broken wires inside of the door flex conduit. Sure isn't much room to do anything in the space between the door and the jamb.
So, I decide to remove the wiring harness completely from the door and van body. I figure I'll really replace the broken wire and that'll be the end of it for quite a while.
Removed the door panel, heavy door paper, and the kick panel...Contorted my fingers and arms in a way that no 55 year old should have to, and finally got the wiring harness off the vehicle. Slid back the flex conduit from the wiring and saw this:

Well, not too hard to see why the locks didn't work, what with that completely broken blue wire and all. But I was a little surprised to see the condition of the other wires. Wouldn't have been long and they'd have broken, too. You can see in the photo where I repaired previously broken wires and the splice was taking up space in the flex conduit. Time to do it right and replace the bad wiring by placing the splices close to the cable ends.
If I was smart, I'd leave it at that. But I've never liked the door switch position; it's awkward to get at to press the window and lock buttons. I'd like to see those switches on the dash where they'd be easy to press. Help! Can't stop myself from wanting to move the switches off the door...