J. Kissel reporting for P. King and S. Ballmer

During recovery of the IFO after this morning's CDS, PSL, and VAC work, we noticed that the reported power into the IMC (H1:IMC-PWR_IN_OUT16) was 1.6 W when we requested 2.0 W. We first suspected a mis-calibration of the rotation stage, but after some detective work by Peter and Stefan, they found that 
 - the sum of the reflected and transmitted power around the PMC (H1:PSL-PWR_PMC_REFL_OUTPUT) was also low, reporting ~54 W instead of the 61.5 W it was ~12 hours ago, and 
 - the diffracted power from the ISS AOM (H1:PSL-ISS_DIFFRACTION_AVG) was high at ~3.5% instead of 1.3% (again 12 hours ago).
Peter suspects this may be a result of a different electronics voltage offset as a result of his work this morning (aLOG pending).

To fix, they adjusted the offset to the ISS loop (H1:PSL-ISS_REFSIGNAL) from -2.1 to -2.445 V, to restore the diffracted power.

Attached is 
- A trend of the relevant channels
- The PMC overview that shows the power surrounding the PMC (now in its nominal state)
- The ISS overview showing the REFSIGNAL in the lower left corner, and the now nominal diffracted power diffracted power
- The accepting of the new offset value for the REFSIGNAL