That lamp is the MOST likely problem, because it gets roughed up in transit. Thousands of miles in a Semi-truck and rough roads adds up to cracks in the lamp glass -- next thing you know the Glass reflector inside is all milky looking from the leaking mercury Vapor gas inside....
The part number is 915B403001
This place sells OFFICIAL Mitsubishi Lamps -- with or without casing (get the casing).
Or you can contact Mitsubishi directly, the number is XXXXX the instruction booklet.
If you have any questions, just ask
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Tips are greatly appreciated !