I've noticed that FSS mixer output readback was about 0.5V when FSS was locked, which sounded very large.
Peter and I looked at the trend going back 180 days and it seems like the mixer output has never been small but it got bigger on Tuesday last week (attached right).

When the refcav crosses fringe it goes from 0.5 to 1.5V roughly as of now (attached left) so it seems that the refcav is still locked to the center. But I wanted to make sure that this is just the readback problem and Peter offered to take a look at analog signal tomorrow morning.