One of my fat PS3 has the YLOD; with the guide and the kit that I bought i resolve the problem. Now the PS3 works perfectly!
It was more easy than I thought. With step by step guide you can do it very simple. It's strange use an heat gun. In about 1 hour I finished the job. The thermal paste is not so easy to use
First you must be organized, patient and have all the time that you need. Make sure you have a lot of space to put down all the pieces of PS3;
When you take off the upper cover don't be scary to pull (I know that it seems to broke plastic); make attention when use the heat gun, make sure to heat all the board before and make sure to use a perfect levelled support; if you don't want thermal paste everywhere warm it a little little bit before use