Had my Panny projector for over a year and whilst it still performs flawlessly I was wondering whether I should have it cleaned internally to maintain its life. Had a few dust blobs abour six months ago which Panasonic kindly removed free of charge (was under warranty) and donlt want the hassle of these recurring. Has anyone attempted a DIY clean?, if so is it easy ? What are the do's and dont's. What are the estimated dealers prices for such a service. Any info would be appreciated.