Well, it's now two years, and I finally got to the window mechanism today. I did speak to the former owner, and he was surprised that I was having a problem. I took the window handle off and the door pull, but struggled with the door handle, because I could not get the little locking pin to come out. I suspect that it is tapered, and only comes out one way. I used silicone lubricant but could not get it to budge.
Finally decided, it was far enough near the front, that I could get at the mechanism to see if there was an obvious problem. I pulled off as much of the door card as I could, and sure enough there was enough room. Everything looked fine and clean, so I proceeded to lubricate the gears and pivot points, including the latch to open the door, and the sliding mechanism under the window. I also lubricated the channels including the channel on the A post.
The net result is a window on the driver's side which now works like a charm. Not a very big job, even for an amateur like me, and it was very satisfying. I cleaned everything, and picked up and put everything away, and now I'm due for a beer.