Optoma ML500 Led Projector weak light

I have a LED projector with very little use, the fans were running faster and suddenly the light intensity down. A lot of luminosity was lost, I disarmed, I cleaned (it was quite dusty) and I put it together again. I never recovered the intense luminosity again. Can someone help us? its the power? the lamp? How we could find the problem is? - Thank you.

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