I have a Shadow pinball that is making the "bong" sounds and displaying the Coin Door Open Disabling High Power message during game play. The coin door is indeed shut and the high power never seems to be turned off. It is an intermittent occurrence that sometimes does not happen at all, during the course of a game. When it does happen it lasts from half a "bong" up to several seconds. The game seems to continue as normal, otherwise. I replaced the interlock switches to no avail. Any ideas?

I have tried to do this. I have lifted the playfield and closed the door just so I could get a look at the metal plate position. I am fairly certain the switches are engaged. I thought this might be a ground issue but I would expect that the high power would indeed be turned off, if that were the case, but all of the solenoids fire as usual.

I will check it out tonight. When I swapped it out for the new switch, there was a little bit of corrosion on the wires. I may not have gotten it all cleaned up. Thanks LTG!