I turned off the Fastbus on the Left Arm. I found the +5V at the crates to be 4.46V, too low. The power supply was putting out 5.11V, which should have been sufficient. The voltage drop seems to have been across the board with the current shunt, the drop should only be less than 0.1V. The cable from the board to the bottom crate was HOT. So, I turned it all off. We will look at it as soon as we are able. Hopefully it is only a loose connection on the board with the shunts.