Noisy Fan - Remedy ?

[SRFast]

I've owned a G400 Max since August, 1999 and it has been problem free. Since I leave my PC on 24/7, it appears the cooling fan is making noises, like it needs lubricating. What is the best way to do this ? Can the fan be replaced ? I am using the DVI module and there is minimal space to work, so a larger fan won't work.

TIA...JL

[Greebe]

apply a very small drop of light weight oil to it's shaft under the label.

[Sasq]

Some more info for those that need to replace it
(fan is made by Aavid)

G400Max fan 40x40x7
Aavid P# 1447122
0.13a 5vdc 0.65w
4.5-6.0 vdc range
6k rpm 4.8cfm
1.9mm H2O 0.075 inches H2O
25dBa spl
fan speed can be measured via blue wire (tach out) and the red wire (+5vdc)