Serial number disappears from the system profiler... How to get it back?

Hi there,
We have come across a known behaviour where the serial number of the computer disappears from the system profiler and 'about this mac' menu, whwnever the logic board is replaced. Any ideas how to get this information back on the computer(Seems all the macs are affected)
Is it possible to flash the firmware to copy the contents? Heard someone trying to flash BIOS? will this work or will it damage the firmware? Please HELP!!!

You might want to take a look at this Developer Tech Note:
http://developer.apple.com/technotes/tn/tn1103.html
Specifically, this quote:
"Caveats for using the serial number
It is possible for a system to lose its serial number so that it will no longer appear either in System Profiler or the I/O Registry. Repairing a system by swapping hardware components is one reason this can happen. Apple does not document the specific details of how a machine can lose its serial number. Once the serial number has been lost there is no means to restore it to the machine."
It sounds like there may not be an easy (or documented) way to put the serial number back.
Steve

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Serial number disappears from the system profiler... How to get it back?

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