repacking wheel bearings

I've got a slight disagreement with the Service Manger at Twin State Subaru (with whom I've been very happy and whose opinions I generally respect) regarding repacking Subaru wheel bearings. I need help to understand the mechanics of the situation, as well as proper installation procedures.

The basis disagreement is that Service does not believe the wheel bearings can be repacked without destroying them. True/False? So long as I catch a problem with a replacement within the 1 yr warranty period, thats ok with me, except I've got to put up with the noise until it is loud enough for the mechanic to hear. I would prefer to have the replacements last more than 15k miles.

Are there any TSBs issued regarding repacking wheel bearings (Service says not)?

Any independant documentation I can offer in support of repacking?

help please.

Thanks to all, and have a great time in Reading

Steve