Newbie here, thanks for reading. 
  
Driver's power window not raising or lowering properly.   Motor seems to be working, so I figured the regulator was faulty. 
  
Removed the door panel and observed that one of the scissor arms --sturdy sheet metal--had sheared off near the center of the scissor mechanism. 
  
Obviously it needs to be replaced, but I wonder what could have caused this ?  I have noticed that upon releasing the contol buttons on driver's and passenger sides that the motor seems to still be going---this is only when the windows are being closed. 
  
Looks like a few bolts need to come off to remove the old part...any tips or tricks to this procedure? 
  
Thank you , 
  
Legacy Wagon 241K miles