My JVC rear projector HD-56G787 has a piece of dust on the inside of the screen that can be seen while its on. I used a can of compressed air to clean the small gap around the screen. I've done this before with no side effects. This time the dust showed up. I'm assuming its on the lens in the base of the tv since the dust wad is about 6 inches on my screen. Is this something that I can clean by removing the bulb or front screen? I don't mind tackling a job like this provided it doesn't take any special tools. Any suggestions other than calling a technician and paying him the 1/2 the price of buying a new tv.