In checking on the ETM optical levers prior to next month's vent, it was discovered that the ETMy optical lever was OFF, and had been for some time.  I found that the laser had failed, so this afternoon I swapped in a spare.  The serial number of the new laser is SN 189-2.  Please note that this laser has NOT been tweaked for glitch-free operation; I simply swapped in a spare so that we have an alignment reference for the upcoming End-Y vent (I will swap in a tweaked laser once the end station work is done and I have had time to prepare one).  Once this was done I re-centered the optical lever in preparation for the January vent and ETMy optic swap.

Looking back through trends, the ETMy oplev laser failed during the September power outage, and was just now swapped out.  I will admit that during the corner station vent I have not been paying as much attention to the optical levers as I should have; this laser failure should have been noticed and corrected immediately, not 3 months after the fact, so this one is entirely on me.