window regulator or clip, please advise..

[bagpype]

So conveniently tonight my drivers window decided that it wasnt going to roll up. This, as it happens, is during a small break in the midst of several days of forthcoming torrential down pour. I have a shop close by my house thank god. I went there, pulled the door panel, pushed the window up and it went up. My questions; I read that there are plastic clips that break and the regulator could also be bad. How do I check which one I need to replace?? Where is the clip located and can I eyeball it to see if its broken? Any help will be greatly greatly appreciated. Thanks in advance..