Is there a way to put the OS kernel into a full logging mode?

We have a system that's likely suffering from a hardware failure, most likely something like a cracked trace or intermittent connection from a bad solder joint on the motherboard. The system is a 1G G4 iBook (early 2004) and these have been known to suffer from this type of problem. The symptoms are the system will run fine for hours, once in a while even days, and then just lock up forcing the user to have to turn the system off and restart it.
Rather than popping the unit open and start resoldering "suspect" connections hoping that we might just stumble across the right one, I was wondering if there's a way to log kernel activities that might help point us in the right direction. FYI, the unit passes AHT tests, but the problem is very sporadic.
Thanks

The only thing that's likely to help you is a service manual and a person who knows how to use it, but you can download a version of the kernel with debugging symbols included
http://developer.apple.com/sdk/

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