The door buzzer labels are hard to make out on the YouTube video, but might be ...
top left: T.C
middle left: L.H. (or possibly J.H.)
top right: G.C. (or possibly G.O.)
middle right: B.D.
lower right: L.B. (or possibly G.B. or D.B.)
The more I look, the more possibilities I see. We need the Revver version.
