Woohoo! Kind of. More comments to come as I have a chance to use it a bit more. According to the parts sheet, they replaced the logic board and the speaker assembly.
Pros:
CPU noise has changed. Instead of being a high-pitched whine coming from the back-right of the case, it’s now a barely-audible hiss coming from the left side of the case. I can barely hear it in situations where I clearly heard the whine before. A definite improvement, but the fact that there is still noise is disappointing.
The backlight is different. No more flicker at ALL at any brightness setting, and silent, where there was inverter buzz before.
Cons:
The speaker, which is the reason I sent it in in the first place, is still busted. Maybe after school is out I’ll take it down to the apple store and see if they have any better luck telling the guys at the repair center what’s wrong.
Working on installing 10.4.6 and the firmware update now; apparently those also fixed some issues people were having.
//Edit: OK, 10.4.6 installed, firmware update installed. Still gets hot, but not to the point yet where it’s uncomfortable through pants like it used to be, even after 45 minutes of Warcraft. Still wouldn’t use it on bare legs though. Airport picks up access points waking from sleep, unlike before. I did pick up inverter buzz, but it’s not nearly as bad as it was before, like the CPU noise. I’m still kinda ticked about the speaker, though. Oh well.