Still have fan RPM alerts on G5 XServe

I've been getting email notifications from a XServe G5 dual 2.3ghz (10.3.9) about the fan speed on the system controller fan. The reported speeds have been in the 14000-14700rpm range. Usually a few seconds later I'll get another email telling me that the speed has dropped below 13000rpm, though every once in awhile it will race up and down for a couple of hours. But it will then usually sit in the 10k-12k range for days and weeks without problems or warning.
From previously answers, I went ahead and blew out the dust. But I'm still getting the System Controller fan on occasion spiking at 14,500rpms for a few seconds. Temperature for the System Controller seems about steady at 44c ambient /55c internal.
In the past few days, I've started getting dozens of these alert emails - always spiking and then 10 seconds later back down again.
Suggestions on what to do?

Ive had the same issue on a 10.3.5 machine
after some research apparently this happens a lot.
fan was @ 14000 constantly.
Apple said it was environmental. So I placed a 30cm fan infront of the server blowing in cool air.
Fans now spin @ about 11000 rpm. Still too hot for me, as a 2nd xserve spins @ about 6000.
Ive ordered a new Fan Array that i will install next week and see if that fixes it. (faulty fan or sensor is my thinking). My CPU fans are spinning @ double their usual speed to, about 8000rpm, but temps are all fine.
Macbook Pro   Mac OS X (10.4.7)  

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