After reaching LOCKING_ALS, Sheila and I tried to lock both arms to red in the CHECK_IR state.  We lost lock every time we tried to reach CHECK_IR, and were unable to achieve ALS_DIFF locking robustly.

We tracked our issues down to a regular ~1 Hz in-loop glitch in ALS_DIFF, which with higher gain settings caused saturations in our L1 and L3 ETMY stages.

Sheila turned off the length control to ETMY and high passed the DIFF PLL control signal.  The glitches were still there. 

We also noticed that the glitches were appearing in COMM as well.

This indicates something is probably an issue with the sensing path, could be the amplifier removal that was done today to remove RF saturation on the ALS DIFF PD.  We may need to handle COMM RF saturations by removing its amplifier as well.