Bulb warning light

Hi all.

Just after some advice really. Recently been getting a bulb warning light appear on my dashboard. This suggests to me there is a bulb out somewhere. However I have checked the following

brake lights
reverse
fog
side
head
main beam
dipped
indicators

all of which work.

I need to check my license plate lights but I don't think that will be the cause. So do you have any thoughts on why the warning light is coming on??

Read several possibilities, faulty relays, bulbs starting to fail.

Was told it might be worth trying disconnecting my battery to reset the computer but I don't want to risk losing all my servicing information on other sensors.


Any thoughts??

Thanks in advance