A bearing failure is always a possibility, but I really doubt that's the cause. My guess is the pinion just lost it's pre-load because the crush sleeve was not collapsed enough during assembly. It happens. I think your looking at a good resolution requiring only a new pinion seal and re-checking and setting up the pinion depth, case pre-load and doing a pattern check. Basically, they just need to inspect and put it back together again.......correctly. It's possible their is damage inside, but I doubt it. Watching your little video, due to the pitch on the pinion nut, it probably would take less than one turn of the nut to remove that end play. But they should start from scratch, and you should center punch the pinion and nut so you can re-check it regularly for back-off. I also load the threads of the pinion nut with Locktite 271. Especially if the nut is going to be re-used. I feel pretty good about your chances of the parts being OK except for the pinion seal.
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