I have a sliding glass door that is 72 inches in height and 84 inches in width. The door has not open very easily for months, but with the weather warming, it has become worse.
It is a United Vinyl door with double-pane argon filled tempered glass.
It appears to be that the cause is the actual frame around the door, which has sagged slightly above the door opening; squeezing the door on one side, making it harder to open. It is not the door itself, as the door is new, the wheels are new, and the track is clean.
(1) Is there any way to fix the door without tearing it out and re-framing the door opening?
(2) Can the door be salvaged in this process?
(3) Does this sagging suggest a much larger problem?