window regulator problem?

[chiefsalami]

Hello guys, before I pull my door panel off, and risk breaking clips and whatnot, I am hoping for some advice. One of the rear windows on my 2001 X5 slides down a little on its own. The electric switch can be used to pull the window down, but does not push it up. The motor works, but I hear a clicking and slipping sound when I try to raise the window and therefore have to do it by hand. Once it is up, it slowly slides down and does not stay up.

Is this definitely a window regulator that needs replacing? Is it possible that the regulator is ok, and there is something that I just need to adjust once I pull the door panel off?

I'm trying to avoid buying a new regulator if I don't need it, and avoiding pulling the door panel off unless I have a regulator ready to install, since I don't want to do it twice.

thanks!