Crunchy sound from window - no longer works

[Coaster]

Hi. When putting down the top last night I thought I heard a crunchy sound from the passenger window. When putting it back up, I barely got the window up. Had to push the up button a few times before it was close. I think it's done moving for now. It's not completely closed but just below the roof. Don't want to move it up and down more than I have to. Does that sound like the regulator? If so, any info on how to replace that? I assume I can get the regulator by itself but not sure by the threads I've read so far this morn. Thanks.