The rapid flashing light is still on, the suggestion was that the coin drop door was open and it appears to be on one of the screens, but don't know how to cursor to that line or turn it off.
You do it the same way you turned the double-up feature off. When you're on the screen for the drop door setting, do as the screen says, and turn the jackpot reset keyswitch on the side of the machine once to toggle the option on or off. You want it set to "no", as seen here:
Does anyone have the dip switch settings for the PE+?
The only DIP switch setting for the PE+ deals with whether the power line-in voltage is 50hz or 60hz. The other switches do not do anything (in theory). If your PE+ is working, do not change any DIP switch settings. All configuration settings are done through the self test menus.