Hi! Your lamp is nearing the end of its life and needs to be replaced. You can do this very easily yourself and your manual explains how to do it. It's two screws. Order it directly from Mitsubishi. The OEM lamp costs $249. Do not buy an aftermarket lamp from an online retailer. They are of inferior quality, normally do not come with the cartridge can damage your set and they usually cost as much after you add the cartridge.
Here's the link for Mitsubishi.
WD-65733 Manual.
Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:
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