You can probably reuse most of them, especially if you heat the case to 250 ℉ before removing them. The trouble is that you can spot a bad one, but there's no way to know how long before a good one goes bad. The left side main shaft bearing is the most prone to failure, so I wouldn't reuse it. If you decide to reuse the mains, be very critical in your inspection. I would call that case repairable, BTW.