Not sure what the button is, however the lights on the dash..
will go down (will go out from the left, you lost one already) in this order.
should not have a service to the car (type 1 or type 2 depending on age / milage)
from this point on you are running danger for service
1 amber + 1 red.
There is also a clock in that area somewhere that says the "yearly / 2 yearly stuff neededs doing (like brake / power steering fluid).