Moved to G4 MDD... want to upgrade fans. Fan specs? Internal temp sensors?

Hello!
Just a week ago, I upgraded from an older Quicksilver (single 733) to a Dual-1.25 Ghz FireWire 800 MDD. To say this machine leaves the QS in the dust is an understatement! This nifty MDD feels faster running Leopard than my MacBook Pro does!
In any case, while the noise is not as bad as I feared given the reputation of the "G4 Windtunnel", it's definitely a bit more annoying than the QS it replaced. I've noticed that it's not bad when idle, then when I start using it for any heavier-duty stuff (EyeTV, for example) one of the fans kicks in at high speed - keeping the G4 cool makes it much more "ear-friendly". I've kept it out in the open as much as I can, to allow for ample airflow, but am considering replacing one or more of fans with more quiet ones.
I have three questions:
1. How do you tell if this MDD went back to apple for a fan replacement? I know they were recalling them for a while.
2. What are the airflow and noise ratings of the fans - or at least the big case fan? I'm comfortable swapping out the fans for ones with higher airflow per unit noise, but do not know what the baseline flow is!
3. I have yet to find an app capable of accessing the temperatures of any sensor other than the CPU board and the hard drives - yet I know there are more sensors in there. Is there some app, apart from iStat or Temperature Monitor, that can read the other sensors?
Thanks for tips,
-Daniel

Hello,
I modded my G4 MDD a couple of years ago.
Upgraded the main large fan to a Vantec Stealth super quiet fan with the silicone noise reduction kit.
Upgraded the 2 fans on the power supply too using x2 Vantec fans.
Also did the mod fitting 2 smaller fans behind the processors using a fan controller I bought from Maplins. Works a treat keeping the mac super cool & quiet.
Ulitmately the rear fans acted as an xtra exhaust sucking the warm air out of the unit instead of it creating a nice cool area between the main fan than processors.
Its all quite easy to do if you are comfortable/confident in messing with it.
Installed drives to 7200rpm and again used silicone quiet kits when reinstalling.
It also helped installing an ATA 133 pci card with decent cables which I think made a huge difference in overall performance.
Ram coolers are also a good addition.
I wish I hadnt have sold it as it was a solid machine and put some of the earlier G5's to shame.
Good luck & have fun
Did a cool little mod fitting a blue neon cold cathode tube which illuminated the front retro exhaust ports which was cool. Again this was powered using a molex connector of the DVD drive, simple but nice mod.

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