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Dell Optiplex 760 bad fan noise.

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Ok, so basically, My Dell Optiplex is 3 years old (warranty expired), and I seem to have this annoying and strange noise coming from CPU Fan. The system is cleaned regularly I look after it. I have tried to lubricate the fan but I don't see any tabs or access points to get to the bearings. If anyone has any ideas on how I could remove this noise it would be much appreciated. Also the system never actaully heats up. Specs are below;

Fan: Sunon Maglev
Optiplex upgraded  Heat sink 
PSU: 255W Dell standard
GPU: Nvidia Geforce GT 520 2GB (with PCI extender)
CPU: Intel core 2 DUO 2.66GHz
HDD: Seagate 7,200RPM 80GB
RAM: 3GB DDR2 Samsung PC2 6400U (800MHz)
O.S windows 7 Professional edition 32-bit

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