What kinds of problems is your b-n-l seeing? The only moving parts that I'm aware of is the color wheel and the 1-2 million mirrors (720p vs 1080p) that are located on the DLP chip itself in an area about the size of a postage stamp. There is absolutely nothing any technician could do for the DLP mirrors other than replace the entire chip or maybe clean the window on the surface of the chip that the light shines through. Any other mirrors or focus lenses should be set in a fixed position.