help with removing daryl products patiorama sliding door

I have an old patio door and I am trying to remove to check the health of the wheels. However, I cannot get it to come out of the track, and I cannot find a way to lower the wheels. Can you help? I enclose a picture of the end of the door

Thanks for the video. My problem was the adjustment screws were deeply embedded inside the door and I could not see the heads. As it turns out, one was a hex head and the other a slotted (55 year old door). I got it off and inspected.