747X Door 2L Ground Service Switch

[Peter_Pilot 0]

Dear All,My first AVSIM/PMDG post. Apologies if this subject has been covered before, I have done some searching of previous threads.As a real world mechanical design engineer I sometimes struggle to make sense of electrical stuff and need help. At the moment I am having fun trying to comprehend the electrical system on my PMDG 747X. Maybe one of you would be kind enough to confirm whether I have understood the following correctly or not.SITUATION