NSP PCBs were on the earlier MPHIs. If you look on a later version MPHI that just has the 2 PCBs (MPH and HR2), you'll see those resistors/capacitors incorporated in the HR2 PCB under the relays and the HR2 PCB is a little taller. I have both styles on my route. I've had that same resistor open (on different cars older and newer versions) about 3-4 times in the last 12 years. I bought a pack of them from Radio Shack and keep them in the truck.