Looking over the PSL this morning, I noticed the RefCav TPD dropped from ~0.86V to ~0.8V over the Labor Day weekend (see attachment).  Checked with the on-duty Operator to ensure no one was using the IMC (no one was), so we took it to offline and I remotely tweaked the beam alignment into the RefCav to attempt to recover some of the lost TPD signal.  I was able to get the TPD up to ~0.885V with the IMC unlocked (~0.86V with the IMC locked, unsure why the difference).  Will keep an eye on this, looks like we may need a PSL enclosure incursion sometime in the next couple weeks to adjust the FSS path alignment on table.