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have the store fix it you need a tech that has the right equipment to fix that. Since you say you replaced the lamp I assume you mean a LCD micro projector not an LCD Flat panel. There is a piece of equipment that a tech should have that can be plugged into the TVs circuit board and it can fix the spots with an electric pulse. I have seen in done on micro projectors in the store that i work by our techs. So my advise is have the store fix it before your warranty runs out.
Unfortunately, this sounds like a problem with your TV's lamp. They are not cheap to fix. Search Ebay for a new lamp and get someone to install it for you. These Mitsubishis have a design flaw that make the lamps burn out quickly. One thing that will PREVENT this problem is making sure that the TV's vents are clean.
dirt internal to the tv. suggest taking the screen off and removing the small rectangular panel in the middle and spraying off LCD panels located under metal fins. this should fix distortion.......for now.
As I'm sure you will notice that you rub your finger accross the lcd panel when it is on and you will see a blue trail as you cross the screen. I would simply try to wipe the spot with a soft dry cloth while the unit is on and see if that corrects the problem. If not I'm sorry to say that the lcd panel has been damaged.