Drove home with the top down yesterday. Got home, put the top up, and tried to roll up all the windows. Driver's side rear window wouldn't go up. I could hear the motor working, but the window wouldn't move, just a lot of clicking. I had my wife pull it up while I worked the switch. I just bought the car three weeks ago, and am working through all of these little problems. Is this going to be easy for me to fix? The car is a '91 LX convertible.