My PS3 is playing up also and its a launch date 60gb version, my issue is it only reads my game discs like GT5P and CODwaw every so often! about 3 in 10 attempts will read

I have run a laser cleaner discs ( the ones with the small brushes on it ) through it many times over the last few days and still it only reads the game disc when it feels like it and sometimes doesn't even notice the cleaning disc
I used to maintain the slimline and chunky PS2's in my house by opening them up and manually cleaning the laser and reflective lens below it with cotton buds etc .. but I'm not sure I want to take a PS3 apart incase there's a small chance I will mess up any chance of a replacement if a manual clean doesn't work and the seal being broken is an issue for Sony?
Any ideas or suggestions appreciated as I can see this problem get worse as the days go by