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How to prove USB hardware problem for maintenance?

Hello,

So we have tested our device on 4 other powerbooks and have determined that the problems exhibited by the new 15" powerbook of a beta tester seem to be a defect in the computer. Whenever the AC adapter is taken off the laptop, it causes the system to loose data coming from our device on the USB bus. We have extensively tested with identical powerbooks and the problem is only exhibited in this one unit.

The problem now is that it seems to be a problem with power regulation (or something else) which will not cause a total failure but will rather slow things down on the USB bus. For example if we connect a USB flash memory and copy a large file, it will slow down once the AC is unplugged because data is lost and packets retried.

However, how can he get this serviced? it's not something that he can show at the Apple store. Any suggestions? It is my understanding that he has to show what the problem is for it to get sent to Apple for service, am I incorrect?

Thanks,
Juan
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