While that approval process in manufacturing does sound nice and logical, it's still disturbing to me that when I took my MBP to the Apple store with the obvious issue, every diagnostic test they ran came back as passed. So something in their testing process could be enhanced to try and catch some of these issues.
I'm also a bit confused by much of the conversation here though... everyone says the issue is a failed Gpx card, and I'll agree with the theory/fact that the solder is failing for one reason or another - I'm not a computer scientist and didn't tear the machine apart enough to determine whether that's the true cause or not, so I'll go with what others have said as a solid theory. But everyone is upset about that one particular part, and claims that it'll fail again - and it may. I'm honestly concerned about that as well. But just like the rest of the American society that goes to the doctor and says "I'm sick, give me a pill", the conversation here are asking for the pill. But no one seems to be focusing on the root problem.
What is the root problem? I don't know. But I have speculations that there are more issues than just solder. Why is the solder failing? It appears to be from heat. But why is it only failing on one part? I don't know, but my speculation is a poor airflow situation. People have said that a cheap PC can outlast their MBP in lifespan. Listen to a cheap PC - do you hear the fan noise? Do you see the multiple air vents? Where is that on the MBP? I know Apple has attempted other design methods of airflow and cooling components, but I often question it's effectiveness. I know in my early days of building PC towers I didn't have the air flow set up correctly and the temp was out of this world, and I fried parts that way - including CPU's.
I'm not saying I have all of the right answers; but the point I'm trying to make is that we are really harping on the symptom and how to "cure" the symptoms - we aren't focusing on the root issue of why the symptoms occur. You can throw pills into your machine all day long (replace / reball the Gpx/logic card), but of course the symptoms will come back because you never addressed the root issue that caused the symptom. Think differently - as Apple Computers always says....
And I think it's interesting that people are asking in this forum if anyone has found a "solution that works". Well, in my case it took 3 years and 3 months for it to fail the first time. I did go through the Apple Store and had the Logic Board replaced - and I haven't had an issue in the 1 month or so that I've had it back. So I'll report back in 3 years and 2 months when I have given it a valid test as to if the "solution works". With that said, I could have had it reballed, but I think the only way to truly answer whether or not there was success was to give it a valid test - of TIME. In addition, everyones usage is different and thus everyone will have different results. What software are you using? Are you in an air conditioned environment or working outside in the sun with your machine every day? How many hours a day is your machine running? Do you shut down your MBP often as opposed to just putting it to sleep? There are so many factors that go into what causes heat in the MBP that there isn't an easy way to determine success from one machine to another.
Despite me now joining the crew of ranters on this forum, one of the other root issues is that there are an uncountable number of failed machines, yet none of us uncountable number of failed machine owners are taking active action to get Apple's attention. A petition that is never sent to Apple, blindly bombarding employees of Apple with hate mail on one day, ******* and moaning on a forum that the decision makers of Apple rarely read... What is any of this going to do? Nothing. If we really feel that Apple owes us something, larger action needs to be taken.