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...looks like a double hangar roller in the photo. The track might have to come out if that's the case. Our OA uses a "captured roller" arrangement on the back sliding door (the rollers and track are installed preassembled on the door frame. That said, if it is as I suspect, then that top trim strip would probably have to come off to allow the door to tilt outward at the top....then lift out of the lower depression. Hard to tell from the photos....
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