PGT sliding doors are hard to slide

A home owner says:
I bought a condo with PGT sliding glass doors type: SGT 2000/2500
The doors are hard to slide, how can i get to the rollers to lubricate or replace them ?
Help would be very much appreciated by my dear wife Ursula - PLEASE HELP !
Thank you in advance
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Tom from SWISCO responded:
Sure thing! See the video below, this details the best method of removing rollers from a patio door. This works for most doors.
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