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to clean the lamp: no chemicals, nothing abrasive. you can touch the outer glass (not with your fingers), but do not touch anythjing inside the bell. best thing to use is a microfiber cloth. your lamp is nearing or has passed 2000 hours of use. the projector is telling you to replace it before it blows (and sometimes shatters). after you replace it, reset the lamp timer (through the menu).
the cover switch is probably not fully made.
Ensure that the cover tangs are pushing the pin
on the miniswitches.
Try putting slight pressure on the fan or lamp cover to see if the lamp/cover light
you will need to do a restart on the PJ to check this out