I turned on all of the remaining filter cavity systems in the center and end room. Also Koach filter and air conditioning in ATC.

I reloaded the DDS. I didn't check everything yet, but the RF signal levels I did look at were the same as before.

Homodyne PSU: +19 V 64 mA, -19 V 60 mA ok

OPO Temp Act: 7.116 ok
SHG Temp Act: 3.191 ok

Clock 1: -10 dBm
Clock 2: -13 dBm
Clock 3: -11 dBm
Clock 4: -9.9 dBm

SHG EOM: -9.9 dBm (same as before, goes to +14 dB amplifier)
SHG demod: 4.5 dBm (same as before)

SHG mode matching: 1840 mV + (200, 140) -> 84.4% (same as before)
SHG demod phase: 110 -> 65
SHG error: 576 mVpp
SHG threshold: 5 V -> 9 V - had trouble locking to TEM00 at 5 V but at 9 V it was fine. As before, SHG threshold is 10x higher than the TRANSMISS OUT reading would suggest.
SHG green level: 330 mW (same as before)

GRMC was quite misaligned so I realigned.

GRMC mode matching: 1460 mV + (50, 50, 32, 24) -> 90.3%
GRMC demod phase: 135 -> 195
GRMC error: 1.68 V - the error signal is quite fuzzy. This is to be expected since the modulated sidebands from the ML EOM have to pass through three dichroics. But the error signal PD is very sensitive so the signal is large. I didn't see any of the strange behaviour of GRMC changing optimal demodulation phase at random, and I think it might have been me making an error in aligning the GRMZ assembly at one time. Maybe I forgot to turn on GRPS or MZ PZT while aligning it.

When I was just about to check the GRMC lock point, I lost the transmission, and the cause was another issue...