Last week after my MBP was running hot and fans were on full speed, I shut the lid the set it aside; the next morning the video was dead. I took it into the Apple store, they ran a diagnostic test to check for the specific NVIDIA issue, and it of course failed so they had to replace the logic board. This was over memorial day weekend; I took it in Friday at 2pm, and I had my computer back in my hands by Wednesday 9am (even though Monday was a holiday). Not too bad. All my data was in tact.
I'm wondering now that I have the new logic board, if I should still install SMC 1.3 firmware update that shows up in Software Update or just ignore it. I'd obviously like to prevent any future failures (I wonder if the new logic board actually fixes the design flaw, or if it just gives me another year or two before it fails, too?), but don't want to fix anything that's not broken.
You would think the SMC update actually helps the reliability of the NVIDIA cards, rather than encourages them to fail to "weed" out the bad ones, right?