I take mine apart every 4 months or so to vac. & clean the inside. If you do plan on opening your PS3 for any reason remember to wear rubber gloves, even unplugged a static discharge can damage sensitive some electronic components not to mention the oils from your hands.
You have provided great information about how to maintain a PS3 playstation. By following these instructions we can solve number of issues which we face. Often my PS3’s fan become silent and I didn't have any idea that how to manage it, but after reading your post I got a lot of information.