We don't repair motors anymore, in fact for years. We don't even replace residential backyard motors either. We replace the entire pump which gives the homeowner a new warranty.
Once the bearings go on motors, it usually damages the bearing race the shaft rides on. Even if that's all good and you can replace the bearings, a new motor shaft is needed, possibly a new impeller, volute-now the cost is going up for the repair. By that point your more than halfway to a new pump.
The pump manufacturers have gotten smart over the last few years and they know their competition. They design replacement pumps to match up to existing plumbing of the competitors for an easy swap. Little downtime for a homeowner especially when parties are in the works.
The commercial motors I have worked on in the past, are sometimes worth repairing. 5-15 HP pumps can be $6K-$10K