I got an eMac with only problem being a bad ethernet NIC port. Is it possible to replace JUST the NIC port or does the whole logic (mother)board have to be replaced ? I know I can add the AirLink on the front. But the client really would rather have a hard wired Ethernet connection. I could not find any addons to provide another NIC interface. I have not broken open the case (yet). Any hits or tips on these units ?