Are new MB replacements using the same batch of bad 8600M chips?

My Macbook Pro Santa Rosa from 2007 just died yesterday. I brought it in for Logic Board replacement. It'll cost some days of productivity. But two things occur to me:
1. Do these replacement logic board use the same batch of dodgy nVidia 8600M chips? If that's the case, then anyone getting them replaced is essentially getting a chip that will eventually fail again within 2-3 years. And that's just not a real solution but just a temporary fix. It looks likely because one of my friends had his replacement Logic Board fail within 8 months of its replacing.
2. While the extension of coverage for this problem is a generous gesture on Apple's part, people who have invested in Applecare are not getting any real benefits for this issue from their investment. They're going to be just as much in the cold as everyone else once support is EOL on this item. Shouldn't there be an extension of Applecare as well? Or maybe a discount on a newer model?
I really expected this investment to work at least 6-8 years. Now it looks like it's closer to 4. I'm very nervous about using a machine that I know will at some point just fail again. And I'm just not in a position to sell this one and buy a newer one.

If you read the support documentation, you learn they "may" use refurbished parts. But that does not mean necessarily it would be the same bad batch.
It would certainly not reflect well on them if it is a bad batch. However, if your read my FAQ*:
http://www.macmaps.com/badram.html
You'll learn it is more an art than a science to identify all quality memory chips. So while one can't guarantee there aren't additional chips that are not bad, it is more unlikely that chips that were definitely bad in the first plcae were recycled into your refurbished board.
So be prepared with some backup, in event something does fail*:
http://www.macmaps.com/backup.html
And yes, there are many machines that do last 8 years, even from
the more current machines. A lot depends on usage, and if you have power issues*:
http://www.macmaps.com/frayguide.html
and if you ensure the machine is on a surface where it is less likely to overheat.
If you get repeated failure of repairs, you should insist on getting a replacement Mac when next contacting AppleCare.
- * Links to my pages may give me compensation.

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