Motorola CLS1110: Repair/Maintenance Service? Worth it?

Is there a company that I can send my walkies (Motorola CLS1110) to, where they can take apart, clean, repair, etc. We use about a dozen of them at our store, and I’d like to be able to send a couple in at a time for routine maintenance, every few weeks or so.

But is it worth it? A used unit costs about $80 on ebay and the only place I’ve found so far that services them charges much more than this ($135).