The fact that your sliding door won’t open freely, or has a screeching noise does not always mean it has to be replaced. Some simple steps can come in handy in repairing the door’s rollers. Take off the rollers from the door frame. You may need to lift it over the frame. If that doesn’t work, unscrew the stationary from its frame, and then lift out the roller door. Lay down the door and unscrew the rollers. Take a roller with you to the local hardware to ensure you buy the correct replacement. Replace, screw the new rollers, and fix back the door.