By following alog 58845 I was able to relock the ISS second loop, 
just like Jenne did a couple weeks ago.

Notes during locking:
- Something is weird with the readbacks for the ISS array DCPDs e.g. H1:PSL-ISS_SECONDLOOP_PD1_INMON.  They all have around 400 cts now.  FM9 and FM10 *should* calibrate these PDs into mA, but if I engage them they report 0.3 mA, which is probably not correct.

- The ISS PD sum channels are just zero, e.g. H1:PSL-ISS_SECONDLOOP_PDSUMINNER_OUT16.  This should be whatever the sum of the inner and outer PDs are.

- Had to disengage the H1:PSL-ISS_SECONDLOOP_AC_COUPLING_INT_LIMIT to get AC coupling to do anything.

- Had to change H1:PSL-ISS_THIRDLOOP_OUTPUT_OFFSET to get H1:PSL-ISS_SECONDLOOP_OUTPUT_MON to be around zero.

relevant alogs:
Daniel instructions for ISS second loop locking (alog 58845)
Jenne locks the ISS second loop for the first time in 2022 (alog 61495)