Random Shutdowns Started Again After Fix - Some Questions for Others

::sigh::
After a very prompt repair followed by 3 weeks of constant use with no problems, tonight I had another random shutdown. (Here we go again.) I never was able to find anyone at Apple who could tell me what they fixed (it was not a logic board replacement) but apparently it wasn't a permanent fix.
Some observations and questions:
When random shutdowns start, my "previous shutdown code" in the system log changes to -72, and continue to register as -72 even when I shutdown the computer myself. During the period when the system was working after the repair, shutdown codes were always 0s or 3s. Have others noticed the same pattern? In my experience, once that first negative code appears, it doesn't change back to normal, regardless of how the computer is turned off (except after the repair).
Also, tonight was the first time since my repair that I used the 3-prong power cord with the AC adapter (rather than just the two prong). Could there be any connection (perhaps a faulty cord sendinga surge to the system and damaging something)? During the last round, shutdowns occurred whether on AC power or battery, but I'm wondering if the use of that cord may have triggered the problem in the first place. Has anyone that has had random shutdowns never used the 3-prong cord at all?
The other thing I've noticed is that importing digital camera photos into iPhoto often seems to trigger shutdowns (not all of them, but some of them). My random shutdown tonight happened after editing photos I'd just imported from my camera (and right after I ejected and unplugged the camera). Could the connection to the camera somehow cause a problem? Has anyone who has had random shutdowns NOT connected a digital camera or used iPhoto?
Just grasping at straws here to try to figure out what causes this problem (since apparently Apple hasn't figured it out yet). Looks like I'm going to have to take it back again. I love my MacBook better than any PC I've ever had, but I never had these kind of hardware problems with my PCs (and if I did have a problem it was usually pretty simple to troubleshoot and repair).

I think you're confused, it's not as simple as that.
Here's why - I just ran two yes terminal sessions on my wife's MacBook and let it run for 15 minutes. Fan came on, system is running warm but running just fine.
On my RSD MacBook, while I was at the Apple Store, trying to demonstrate the RSD it ran two yes terminals for like 5 minutes and kept running however when I closed Terminal - wham RSD.
It IS NOT heat related. Most likely the system "thinks" there's a heat problem by a bad sensor, wire whatever.
If I can't run my MacBook at 100% (actually 200%, both cores) for as long as I need then it is defective and should be returned to Apple.
When my MacBook was working I ran EVN (Escape Velocity NOVA) which runs under Rosetta, man that thing sucked the battery dry in less than 60 minutes and the system got pretty warm too. BUT IT KEPT running and didn't shut down. When my system was acting up I couldn't even browse the Apple web site and ut would shutdown.
Greg
PS I installed the SMC update a week before my system started having RSD.

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