replacing rollers on a 8' door. door does not lift high enough to tilt out

A quick learner from riverside,ca says:
door does not lift far enough to tilt out so rollers can be replaced. cannot feel any rollers existing, door is approx 20 years old. 8' opening
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Dave Sr. from SWISCO responded:
To remove the older aluminum patio glass doors, you must first remove the stationary door. All the panels are removed from the outside. You may also have a problem with a "sagged header", which could prevent you from removing the doors. In that case, you could us a "jack" to push up the header.
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