In my house there are Jeld-Wen exterior sliding glass doors. Jeld-Wen Premium Vinyl SGD, 3800 Sliding Patio Door, 2.5" sill riser. Ive learned that model has been discontinued and that Jeld-Wen has no replacement parts to offer.
There are 4 doors. Only the 2 center doors are designed to slide. The 2 outer doors are fixed in place. In the metal bottom frame of the 2 sliding doors, the vinyl material of the "track" on which the doors slide, has irreparably warped in the hot humid Florida environment. A replacement for those vinyl tracks is needed to make the doors function/slide open and closed.