I had this on my DE JP. I'd start with the fuse holder clips on the flipper board. They often look like they are making contact until you realize one side is just flapping in the breeze. The testing process, if I remember correctly, is to just push your finger down on the fuse. You'll find the broken ones real quick.
If that ends up being the case, check out the first 2 posts in this thread: https://pinside.com/pinball/forum/topic/de-flipper-board-fuse-holder-problem
LTG has a great method of fixing them without desoldering the broken clips.