It looks like the phase frequency discriminator in the Y end remote rack used for the fiber laser lock was damaged during the power sequencing problems yesterday.  The output doesn't go negative, even when the signal frequency is lower than the LO frequency.  Maybe it lost its negative rail.  I tried to take it out of the rack to bring into the shop but I couldn't find a screwdriver to get the power cables out at the Y end, so I will go back for it in the morning.  

Sheila