My computer would only play the sound from your mp4 so I didn't see the video.
I dug through all the old archives and found pretty much nothing on this machine. But it seems like I remember the stop buttons on the door have a control board inside the door, behind the buttons. This board maybe the problem. I vaguely remember that this board was a problem to another Tropicana owner.
When does the RE code appear? When you first start the machine? When you first start a game? A few seconds after reels start?
Have you tried pushing the stop buttons?