Are there any mods hooked up to a lamp? I had a similar issue and it was an uncle fester mod that was wired and soldered to a lamp. Once I removed that wiring and cleaned up that area it was all good. If you have any extra light mods remove them and see if that solves it.
https://pinside.com/pinball/forum/topic/addams-family-insert-lights-lamp-matrix-issue-help-please