That's the first thing you should have done.
And you will also find out what's wrong with it in the last place that you look.
Anyone else have any 'helpful' tips to share?
I'm sorry for encouraging someone to troubleshoot their own problem instead of going straight to the internet before taking things apart to try and see what's actually wrong.
I was under the impression that the guy was intimidated about the complexity of inner workings of his door. They aren't exactly self-explanatory, nor easy to take apart. I reread my last response to your post and it reads a bit on the snarky side, which I did not intend.
Carl