[JRTJH]

I agree with previous posters. The timing of the failure (shortly after inspection, regreasing and reinstallation/adjustment) would cause me to suspect that the bearings were not reinstalled correctly (preload adjustment and/or incorrect bearing set placed in a hub where it was not installed in the same race from which it was removed) or incorrect grease was used without completely removing all the "old grease" from the hub.

It may be a simple component failure, but that soon after maintenance was performed on the axle, I'd consider that maintenance the cause until it was proven otherwise.....

The dilemma? How do you "prove" the previous mechanic didn't reinstall them correctly???? I don't think you can..... All the more reason that I do my own maintenance: If it breaks, it's my fault.....