Not an expert by any means. But you can check the resistor R47, but should probably pull one leg up off the board, then check the resistance. Should be 1k i believe. Also your continuity should be from CN6-1 to the top leg of Q72 from what i see on my R&B. Here is a snip of the cpu diagram. Hope it helps. I would check continuity from each point. For example from the resistor to the next point etc.