H1 Manager contacted me because we couldn't get into squeezing. the filter cavity was having trouble locking even green. It was locking on the wrong modes(02 and 01), with FC_TRANS_C_LF_OUTPUT reading below 100. Referencing 72084, I paused the FC guardian, closed the servo for SQZ green, and checked the FC2 driftmon. FC2 had drifted A LOT in the past hours (ndscope). I tried moving the sliders until we were back in the location where we were 4 hours ago when our squeezing was good, but this wasn't enough to let us get back to a 00 mode, and moving the sliders around more in other directions didn't get me closer either. I then checked the SQZ troubleshooting wiki and plotted the M3 witness channels along with the driftmon for both FC1 and FC2. I adjusted the sliders according to the witness channels for FC1 and we got back to a 00 mode! I then fiddled back and forth between using the driftmon channels and using the witness channels to maximize FC_TRANS_C_LF_OUTPUT until we looked good, then I unpaused the FC node and we were able to enter FDS and then Observing!