This is not only just checking to see if the coil is bad, but this help to know that power is even getting to the power bumper at all. Power (thicker gage wire) is daisy chained from one pop bumper to another. So if you don't have power to the one, then you should have a broken power wire coming from one of the other pop bumpers.

Have you considered the drive transistor? You could try grounding the tab of the associated drive transistor to confirm that the wiring (and mechanics) are functioning. This should isolate the issue to the board.

Using a wire with a clip on the end to attach to the ground braid wire in the backbox and then briefly touch the top of the transistor.