I have been asked to make a guide to show how you would open one of these laptops and get to the CPU heatsink to clean it, so here it is:
BePro's Vaio vs. Dust Guide
I used a PCG-FRV31 laptop in this guide.
The guide comes in 3 formats-Online, Adobe Acrobat, and Microsoft Word XP (2002)
I hope this helps you get into it better
PS: Sorry for the lousy pics. My camera is kinda messed up, and I spent my reserved money for a new digital camera on helping my grandparents with a Electric Mobility Chair (they have recently took a turn for the worse).