This is true! It temporarily "fixed itself" because, as I recall, the weather got warmer, which must have loosened the old, sticky grease and allowed the mechanism to work.Was this ever looked at? All I see is in your post #2 that it "fixed itself" - things don't fix themselves.
Richard
I didn't look into anything beyond that, though, primarily because life got really busy and I simply didn't have the time. The thing is, this truck doesn't get driven enough for it to be much of an issue, so repairing things like this sits kind of low on my list of priorities (it can sit parked for 2-3 months before I have the chance to even look at it sometimes).
But now that I do have a bit of free time, and I also have to repair the wiring for the headlights, this would probably be a good time to check, clean and relubricate those sliders.
c