I put some Marvel Mystery Oil on them and it made no difference so I suspect that grease, though better than MMO, wouldn't affect the problem.

It's the checkstrap thing. Given that keyword search and the description I read, that's my problem. Interestingly, the same door has a window that doesn't operate, no sound comes from the door at all. I checked the console switch and it works and I get electricity going to the door.

So I'm thinking I have a bad window motor. I was just going to let it be but as long as I'm going to tear into the door, I'm thinking that a new window motor is called for. No, I haven't done a search on that repair (I will have I send this note) but just looking at the schematic of teh window, that isn't a big deal just to swap-out. Anything special I should know?