Is it tilt switch or slam tilt switch?

One is like crashramp said with the hanging plum bob and the other two are attached to the back of the coin door and the floor of the cabinet.

It will look similar to this - this is not from a Medieval Madness but will closely resemble the picture



Check to see if one or the other has a bent metal tang and is permanently touching which could be a cause of the slam tilt message.

All three metal tangs in the assembly should be separated and not touching like the picture above - you can manually bend them to separate if they are.

If you are still stuck I can grab a picture from my MM showing the locations of where you need to look.