So after the signal from the switches go to the car panel board, they go through the travel cable to the hydro level shifter board in the MR Control panel. On that board they land at the CN1 cable connector, LRU info is 115vac at pin 7 and LRD info is at pin 8. The LED input status, on normal service,at floor level on the shifter board is, LRU info off and LRD info off. the opposite of the car panel LED'S. The LRE info is also off on normal at floor level.