Thought I'd see if anyone has any experience here before I proceed.  Basically my Serene is 5 years old now and the keys need a bit more of a press sometimes.  On the texting bit, you have to leave a bit more time between key presses.  I suppose that this is due to dust/dirt accumulating under the keys.  I was thinking that I could take it apart and clean it out, but I thought I'd check if anyone's tried this and messed up big-time?  The phone is otherwise working great and I don't want to destroy hundreds of pounds of (still stylish) mobile phone