[wingnut60]

There was/is a post somewhere in the past of someone who did this repair and I learned from him--at the time I was at home with time & place to work. Used 2x6 across bottom of slide with bottle jack to lift. According to LCI manual, you can just place a jack on each rack arm and lift it just to get tension off the gears. Says put slide out 1/2 way, I had it all way out. I remember the hardest part was working on back and having to reach about 4-5' up into belly with only short arms. It isn't a difficult job--all mechanics and everything in sight--just hard to reach and move tools. After replacing both sides, had some difficulty in syncing both sides to open close at same time.
I don't remember the LCI manual existing at the time I did it, just parts pics.