This morning I remotely tweaked the beam alignment into the FSS RefCav from the Control Room in an attempt to increase the TPD.  Unfortunately I was not able to get much increase, which means I will likely have to go into the enclosure next week to adjust the FSS path alignment on the PSL table (Robert has the PSL this morning adjusting periscope resonances, and the two activities cannot be done at the same time).  With the IMC offline the RefCav TPD was ~0.71 V, and after the tweak it is at ~0.74 V; for reference, the TPD is normally around 0.95 V.  The most likely cause is a loss of power incident on the RefCav, which in the past has been casued by a misalignment of the FSS's double-pass AOM.