UPDATE
Ordered 3 rollers from Lippert and did some work on the slide yesterday.
Found one roller with a flat spot and two with what looks like some very small cracking.
The rollers are made from a hard plastic like material.These rollers take the weight of the full wall slide when extending/extended. To service/replace the rollers I worked on one rail at a time. I used a small floor jack and a 2x4 cut to length. Placed the 2x4 on an outer L channel next to rail and raised just enough to where the rollers where free from the rail. Will call Lippert and order 3 more rollers.
I also will ask if the inner rollers are available.
I will post some pictures of the hardware I replaced shortly.
Very important to inspect ALL parts on these full wall slides to keep them functional. Been full timing 5 years in this rig and put over 30k miles on the odometer. Oh, I also have the infamous Atwood Levelegs that are still 100% functional believe it or not! I baby those suckey Jack's! LOL