Patio door lower rollers

Hi,
Kohler (not Kohltech) patio door 1 fixed and 1 sliding pane. 23 years old I figure. 2 screws at the bottom of the door, lower one adjusts the roller height, top one I guess secures it into the door frame. the only number on the door is 784008. I don't know how to remove the door, but I'm guessing it's done by raising the roller all the way up to allow the door to clear the lower track? Anyway I'd rather not do that until I do the repair. Hope you can help. Thanks.