Just noticed a warning on DIAG_MAIN that SR3 oplev was low. SR3 is aligned, and I restored all SEI to their nominal status (clicked "recover EQ", and requested sensor correction to be WINDY), so there should be no reason for SR3's oplev to be low.
Attached is a plot of the Oplev sum, as well as the lowest stage OSEMs, showing that the optic didn't move, but the sum disappeared.
Recall that we do not use the SR3 oplev for any damping, so while we should fix this soon, we shouldn't break lock to do so.
Now associated with FRS Ticket 12394.
Will investigate at the next available opportunity, likely during the next maintenance window (2-26-19), unless this gets deemed a higher priority. Tagging this as AOS in addition to SUS (OpLev is technically an AOS system).
The laser is definitely dead. Unfortunately, due to a series of consecutive failures in the lab while tweaking our spare stock for glitch-free operation, we currently have no spare lasers; all of our spares (our 3 designated spares and 2 others) are currently getting refurbished. I have pinged the manufacturer for an update, will request a loan from 3IFO to use in the interim.