Since the FC2 centering is not good now and it could cause the FC2 L2A coupling issue in alog73770, I centered FC2 using IR dither. The first attached figure shows the FC IR error signal with FC1/2 dithered. FC2 is dithered at 7.1Hz in pitch and 16.1Hz in yaw. You can see the FC2 dither peak at 7.1Hz, which indicates that FC2 centering is not good in pitch. I changed the green QPD offset at FC transmission while running FC ASC to minimize the peak at 7.1Hz. I changed the offset of INJ ANG P from 0.08 to 0.18 as shown in the second and third attached figures. After the centering, the dither peak at 7.1Hz is removed and the FC2 centering is as good as one in May.