There is no signal coming out of the I mon at the end station PDH demod.  Since there was a PDH signal on Q mon I swapped the cable so that Q goes to In 1 on the PDH board.  Both I mon and Q mon are on the scope visible from the ceiling cam right now, both 500mV/div.  I also switched the phase shifter from local to remote control, and roughly tuned the phase to 186.92 degrees.