CPU Overheating in X61 Thinkpad

Hi I just got a used x61 Thinkpad in good condition off eBay.
After a clean install of Windows 7 and other programs, I noticed the CPU temp runs really hot on this x61.
83 celcius at full and 55~68 at idle.
Then I searched for the issue online and found out it's a common issue on x61 processor.
Is there a step-by-step repaste DIY I can follow? I will clean the dust in the fan while I'm at it.
I tried searching but no luck.
Inputs are appreciated.

Here is the spec:
Processor: Intel Core 2 Duo T7300 2 GHz
Memory: 3 GB
O.S: Windows 7 64 bit
Warranty expired in October of 2010 so sending in is not an option.

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