Replaced a couple on each of our sliding doors. First check U Tube, not much you can't learn from that site. The door has to be completely removed and laid out, then the frame on one side has to be removed to allow the sliding out of the rollers. You will know immediately if a roller is bad, there are probably a half dozen styles so after you have the bad one in hand take it to one of the major hardware stores for replacement. Good luck.
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