No need to check anything about your machine, the LED style bulbs you bought from us are a vastly inferior technology that don't last nearly as long. They should only be used in home use situations where you don't play your games often, and saving money is a priority. Long ago, these got demoted to our "Bargain Bulbs" section for that reason, and there are warnings on every product page.
All bulbs will dim eventually, but the SMD (surface mounted diodes) style bulbs have been used on location continuously for years without any significant dimming.
Struggling to figure out what to do about these bulbs. People won't stop buying them, and they work in low-use environments, but it comes with a lot of bad press and threads like this which probably do damage to the brand.