Did you also monitor your temps before the logic board replacement?
I'd be curious to hear from anyone else who monitors temps and has had their logic board replaced for this problem.
It might be worth taking some extra steps to verify that heatsink fits correctly, that both sections of the heatsink fit flat against their corresponding dies. As I mentioned in the other thread, mine fit together perfectly (I've never had any problems with mine), but I'm not so sure that's always the case.
It would be helpful to know whether or not some manufacturing variations in the heatsink assembly is playing a role in these failures. All information is good. It would be helpful to know if it is. It would also be helpful to rule it out.
I have a couple screenshots of my desktop from a year+ ago which shows the temps in iStat. Click on the images for a larger view.
In April, 2012 running some apps (adium, coda, mamp, espresso and firefox for 2.3gb of RAM usage and minimal CPU usage) for a total of 71C:

In January, 2013, running completely idle with 1gb ram usage (likely after boot): 62C

I dont think I bothered much with the temperatures before.
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