I went on holiday for a few days, came back and went to work (12hour shifts) so I hadn't really watched anything on my TV for a while. When I got around to it I noticed the picture seemed to look a little faded. What did I go and do? I got the trusty screw driver out and started to dismantle the thing. Wow, was it easy. Step 1: Pull the speaker covers off by the outer edge and swing in towards you. No screws here. Dont be scared theres nothing to brake. Step 2: Once the covers are off youll see four screws. Remove them all. Step 3: Pull the front panal off and youll see right into the heart of your TV. Here lie the three guns from the middle down. Step 4: Undo the four screws which hold the bottom of the screen down. Then pull the bottom out and lift to pull the screen from the top of the wooden cabnit. Place the screen in a safe place. Now you can see the top of the Guns. Step 5: Switch on the TV and wait. Because the screen is removed the picture will be projected onto the wall. Sorry but no 500" picture as its totally out of focus. Once the guns spring into life youll notice a layer of dust covering the glass lenses. Ive only had my set for a few months so it looks as though I'm going to have to clean it on a regular basis. Step 6: Find a soft lightly damp cloth and wipe the lenses clean. If you want to be safe turn the set off. I left it on so I could see what was happening as I was doing it. Step 7: If you can see dust on the mirror give that a light once over. Step 8: Once your happy that everythings clean replace the screen and secure screws. Step 9: Here comes the scary part. If the picture looks better than it did before and your happy with the way it is don't in anyway follow the next instructions as you may make the picture worse. Unless you have an eye for colour mixing forget it. You have been warned. Saying that I had no idea what these controles where before I turned them. Above the right hand speaker there is a set of six controle nobs. The top three controle the colour saturation R,G,B. The bottom controle convergance/geometry R,G,B for the whole screen. From here on its down to you to adjust the picture until you feel you have made an improvment. If you turn all three top nobs up you'll make the picture brighter. If you turn all the top nobs down you'll make the picture darker but all three colours have to be matched or the colour mix will mess up completly. The good new is that you can watch a film while your doing it which helps alot. I used Gladiator as the picture is one of the best I have seen. This information may help those people who have fluctuating brightness or colour staining as you can turn down the red gun or turn down all colours so the picture is darker. You may also notice a sensor by the guns. This may be covered in dust which may also contribute to fluctuating brightness. The use of this information rests souly on your head. There is nothing that will void your warranty like irramovable stickers or tamper proof screws and no way I can see of damaging the guns or mirror. Just be carefull. If your picture needs attention and you have no service engineer then train yourself especially if your lenses are dusty. I hope this post is of some help to you. Regards Kev.