@CynthiaF I found that there are some lifts that bring the lift in a different position for same button from what you say. For example, these two lift

Their switch bring the lift to
Left Button => high
Middle(bottom) button => low
Right button => middle
Maybe, there is really no specific mechanism for every lift π(except that each "Buttons" brings the lift to specific position but you have to find out which one bring lift to which position π)