Things I think should be added to the original ”OP” list.
5A - 1 Before plugging in: with a DMM check that there is NO continuity between the earth pin and active pin or Earth pin and neutral pin of the power plug.
5A -2 check with a DMM that there IS continuity from the earth pin of the power plug and metal parts of the machine like coin door and lock bar.
5B if either fail, have the machine checked out by a qualified person before using. SAFETY FIRST!!
7A Unplug the machine from the wall!!!!

That's a great tip, thanks guys.