One of the weirder things to do is resetting the lamp timer when you change the lamp. After about 1500 hours the projector shows this annoying warning to replace the lamp, however the time does not reset when you replace that lamp with a new one, and resetting the lamp time is a public secret (not written in manuals or settings and such). So I found this website where it has instructions to reset it for a lot of projectors, at least the instructions work for Toshiba one.
Now if you like to have a reference, you might find this image helpful. It’s a screenshot of those instructions :)