After reading this over myself, I'd have to agree with FJK. more pictures/diagrams of your entire wiring schematic is needed for proper diagnosis. Off-hand, though, I'd have to say if your FoC led is going off without the resistor on the pex (which should indeed be a broken circuit) you have a short somewhere else allowing current to your FoC led, most likely a solder bridge on your LedEngin led.