On one of my slides the gear box broke, but it took me a little time to figure out if it was really the gear box or not. I went out on a limb and was able to get another one. Replaced it, and it's been working fine ever since. In my case, the slide came in and then wouldn't go out at all. I was glad the thing died in the "in" position. However, we were getting ready to travel the day it happened. So, we spent several days on the road with a slide we could not open. Once we get settled in the park we were staying, it was just a fluke, but I ran into a mobile tech. He was nice enough to look at my slide (no charge) and confirmed it was the gear box.
I picked up a new gear box and actually had him come out and fix it for me. He was great and didn't charge much. He had it swapped out in about 15 minutes. I would have fiddled with it for an entire day, had I done it myself.
All worked out well. Finding the gear box was the challenge, because shipping over the internet would require we stay put longer, which we were running out of time, so internet purchase was OUT! Finding a dealership that had the same one was the challenge. My wife and I ended up driving about a hundred miles one way to a dealership that had one (that wasn't committed for someone else), and we made the trip. I thought it was rather costly, but I was over-the-barrel and needed it, so paid the price.
Fortunate, the mobile tech was gracious. He did not make any money on that deal. But I sure appreciated his expertise!